Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24ba7ecd941a80c…

MALICIOUS

PDF

78.7 KB Created: 2021-03-10 10:00:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e42e0e5e8cf2dbf03b3ca68f42660239 SHA-1: 5bc6b300f87b5e7c5bb17524b7cbdd8b6fd933b9 SHA-256: d24ba7ecd941a80cba950e2acb127182bf4ec55e3c1cbf0c5dd23f0882ece94c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://botokaw.ru/wix?keyword=glencoe+algebra+2+chapter+3+mid+chapter+test+answer+key PDF link annotation
    • http://jotafitosixa.getenjoyment.net/23010318927.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/KjajbPE/reriroguvakojitu.pdfIn PDF document text
    • https://cdn.sqhk.co/fofodafexadu/dBidih4/big_fish_eating_small_fish_cartoon.pdfIn PDF document text
    • http://bozazareter.iblogger.org/sofowe.pdfIn PDF document text
    • http://terakusinuw.mypressonline.com/36207283927.pdfIn PDF document text
    • http://pofaduxiruk.getenjoyment.net/acls_provider_manual_2020_free.pdfIn PDF document text
    • https://cdn.sqhk.co/jusupovexewa/vIhc4ge/word_connect_game_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/xetasenuwoji/jfh1jfa/3016109973.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/kbUGgfg/satagevezesopejar.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/gchhiga/rogue_soul_2_unblocked_76.pdfIn PDF document text
    • https://cdn.sqhk.co/fimegasaz/f6Fhbgd/fozabepulofujerexurup.pdfIn PDF document text
    • http://bewujasixi.mywebcommunity.org/affairscloud_monthly_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/xibetevoxaj/jcSLwie/star_wars_yellow_spaceship_lego.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dizoran.epizy.com/6633387758.pdfIn PDF document text
    • http://xutagefev.epizy.com/bebamitisupepajavu.pdfIn PDF document text
    • http://nazifaba.rf.gd/pdf_to_word_document_converter_offline.pdfIn PDF document text
    • http://bilexijo.rf.gd/shirley_valentine_script.pdfIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_9c2937c370bb4827ac521e20a63253a0.pdf?index=trueIn PDF document text
    • http://gexijefepawu.epizy.com/21655620998.pdfIn PDF document text
    • https://c33c3ce4-fa2f-4f19-9477-7a801b41b29e.filesusr.com/ugd/ebbcbd_6c1e249d90a740e58c32af3d491929bc.pdf?index=trueIn PDF document text
    • http://megoger.rf.gd/organic_chemistry_reactions_and_reagents_by_op_agarwal_free_download.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 6212 bytes
SHA-256: 2575d2285b5c1493db9478754849c9aa718e7f1058bbd43a49967cfc4abe0b1d
font_01_sfnt_off00010566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10566 11128 bytes
SHA-256: bed6964e144cc40adede5ceb0bf06d4be903391009924260549c89553fa17c0f

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