Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3c5ce7b9f7f5a8…

MALICIOUS

PDF

104.2 KB Created: 2021-03-10 19:24:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0f32d7886dcf977663fc914285806b0d SHA-1: 8ad2be38fd989762c6623b30e98fc028fbcb0e5a SHA-256: 5a3c5ce7b9f7f5a82a6203528200b8c224556405a3b6516b40e5e866c21df20a
264 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains numerous links to external websites, many of which are identified as malicious redirectors or part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though malformed, suggests a lure related to a clinical case study, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/award?keyword=caso+clinico+de+anemia+hemolitica+autoinmune+pdf In PDF document text
    • https://cdn.sqhk.co/kisesawaropo/cjegfvM/epic_battle_simulator_2_hack_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/midipijikami/jjNhd2Y/29971136560.pdfIn PDF document text
    • https://cdn.sqhk.co/kupejabel/cPeQmyN/dubevap.pdfIn PDF document text
    • https://cdn.sqhk.co/tibakekavero/jheOEyS/nojiteb.pdfIn PDF document text
    • https://cdn.sqhk.co/dokukavifig/0jg34ry/xogaxexadazeredetikeja.pdfIn PDF document text
    • http://demepujabad.22web.org/weber_spirit_ii_e-310_black_friday.pdfIn PDF document text
    • https://cdn.sqhk.co/xadeviro/hlLVPHf/54001087316.pdfIn PDF document text
    • https://cdn.sqhk.co/nukusigemug/wgfhiif/deadly_war_zombie_shooting_zombie_games_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/sivujazozis/fjhCjcU/xowonixuwimibikapuzusopaw.pdfIn PDF document text
    • https://cdn.sqhk.co/wakivugex/f1N7gi0/objective_of_ifrs_advisory_council.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_70e9910d0c7c4ecdbd92cc7adbde986b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/balance_sheet_items_in_accounting.pdfIn PDF document text
    • http://mogexusa.rf.gd/what_is_your_due_date_in_spanish.pdfIn PDF document text
    • https://2ddedb0e-b7b0-41c9-a8bc-c018bd0e6e4c.filesusr.com/ugd/70094d_5d63c2c0841d4af6bf554078a93b8f1d.pdf?index=trueIn PDF document text
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_9cb3b9b6b8034a36b590501d9cc9be4e.pdf?index=trueIn PDF document text
    • https://0ac950e2-707a-4e47-8bf4-daface0ea9db.filesusr.com/ugd/356f11_9ccd6076f9fe4ef988a34260bf98175d.pdf?index=trueIn PDF document text
    • https://b8e64ff8-a522-4625-8e91-70fe47930cb2.filesusr.com/ugd/37987b_3ce42e10916a4704aafc5424e67eb05d.pdf?index=trueIn PDF document text
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_ee715b6f0dc44daaa82bd2bb885ae97c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/71945117686.pdfIn PDF document text
    • https://299bc67c-4c9a-44ea-852c-18f2d39dca40.filesusr.com/ugd/954c8b_6925dfeadc3c4471a5d00e543113b876.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/laginekux/marvel_future_fight_guide_2017.pdfIn PDF document text
    • http://danofawo.rf.gd/tropical_house_mix_2017.pdfIn PDF document text
    • https://4a5660cc-52a2-48ff-9acb-4b4f1704cb6e.filesusr.com/ugd/81868d_a3724d4e80ea49a2a7d6a3d8ac48dd06.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA4 2124 bytes
SHA-256: 556dba2d26896e434da42273402e075d3f2a929bd3e1c885d58c7a03cd7575a6
font_01_sfnt_off0001374a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1374A 2948 bytes
SHA-256: a827dd9282368be51964487fd9b701b43eafae4fd9131bd3819bb2195bfb191e
font_02_sfnt_off000141ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141CE 5204 bytes
SHA-256: e639e892dd6fea189014255c22b1d9d744bdf53e5ce75631d842701ca042835c
font_03_sfnt_off00015359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15359 12368 bytes
SHA-256: 1b23f78aa1810d8786a15bd20b49ff66bd6c87d235aa79719c7f674b6e44c776
font_04_sfnt_off00017b9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B9F 16064 bytes
SHA-256: 87bac7116cce17a810d08151410b930347e6d8b8f011720992609d67c697163a

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