Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f373bf8c126dc40…

MALICIOUS

PDF

89.5 KB Created: 2021-04-07 10:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 139daf91053ee86ab4b98cae61cac2a0 SHA-1: 5a5bf055fe4351a4cc31269339bb78f89fa541a0 SHA-256: 8f373bf8c126dc40ac1a586e89877cd501e3f278e0b6608b8568c503895a9139
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://nipisod.ru/123?utm_term=bottom+sheet+android+fragment PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387718/normal_601a3623c6f93.pdfIn PDF document text
    • https://waretufiwad.weebly.com/uploads/1/3/4/5/134581883/2252904.pdfIn PDF document text
    • https://kazajiti.weebly.com/uploads/1/3/4/4/134456981/1533678.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/gh4gjBL/25174966688.pdfIn PDF document text
    • https://cdn.sqhk.co/fixefalid/xhhhjhg/download_game_dragon_robot_2_mod_apk.pdfIn PDF document text
    • http://gixipures.sportsontheweb.net/32176594221.pdfIn PDF document text
    • https://penopamez.weebly.com/uploads/1/3/4/4/134496097/3049029.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370285/normal_6066f56af3bf6.pdfIn PDF document text
    • https://cdn.sqhk.co/mogidamiko/kjisxdW/rugepibazukupesujaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453334/normal_6032a07050716.pdfIn PDF document text
    • https://boziwukajolefix.weebly.com/uploads/1/3/2/7/132711983/4352212.pdfIn PDF document text
    • http://vumajuzatijerak.getenjoyment.net/peter_d_kaufman_net_worth.pdfIn PDF document text
    • http://zanodopowe.sportsontheweb.net/where_is_the_alternator_on_a_2001_ford_focus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450876/normal_6059393df32bf.pdfIn PDF document text
    • http://netopodimamo.mywebcommunity.org/el_abecedario_en_ingles_para_nios.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rozebofukixus/keylab_61_mkii_manual.pdfIn PDF document text
    • http://demovuxogevere.rf.gd/how_to_cite_davis_drug_guide_for_nurses_14th_edition.pdfIn PDF document text
    • http://tewufadab.epizy.com/analytical_essay_guidelines.pdfIn PDF document text
    • http://nugikefabepumuk.epizy.com/login_page_template_in_asp._net_free.pdfIn PDF document text
    • http://jetijawutapa.epizy.com/panasonic_digital_cordless_phone_kx-tgea20.pdfIn PDF document text
    • https://s3.amazonaws.com/befafuni/guzunijometugetanovidalu.pdfIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D5 20212 bytes
SHA-256: d242c5c9a6b0f8d0219a4dcc4fbeaf49bb451bea8eedd7d526c7126306c15540
font_01_sfnt_off000109b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B2 5340 bytes
SHA-256: 567579686dd42714a993cc443bd347645d39fb7cf3282249a619fc5b8e0ee09d
font_02_sfnt_off00011bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB0 10972 bytes
SHA-256: a4620d58e77b27f4f060eed2f50c832133c88f25f60196c8fd05529e27294730
font_03_sfnt_off00014134.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14134 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd