Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0359ebca8c2797…

MALICIOUS

PDF

87.0 KB Created: 2021-04-16 17:12:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 0581062b6b3af229e79cba11d48d6835 SHA-1: 28381bcfeaddc9a1089def899c7e1a12d4b83946 SHA-256: af0359ebca8c2797e0076534847dd7855075074c29b31cbd933b21fe90f393af
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to a suspicious domain likely used for phishing or malware delivery. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or spamming technique. ClamAV detection and ML classification further support its malicious nature. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 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.
  • 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://seumenha.ru/strik?utm_term=resumen+del+capitulo+4+de+la+familia+de+pascual+duarte PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384301/normal_5fd60d8a20785.pdfIn PDF document text
    • https://cdn.sqhk.co/novoganug/cjfUvqz/31718036176.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416321/normal_5ff24a7b361b8.pdfIn PDF document text
    • https://cdn.sqhk.co/gewanunu/h00CjfQ/jugasegegolufe.pdfIn PDF document text
    • https://cdn.sqhk.co/puwokiraf/Zja6cpY/87588839116.pdfIn PDF document text
    • https://lenumerizak.weebly.com/uploads/1/3/5/9/135962539/lamipikib.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/ahcjjha/find_my_apple_icloud_id.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373779/normal_60302e7d49fa6.pdfIn PDF document text
    • https://mepifinifiwiza.weebly.com/uploads/1/3/4/3/134334375/3153491.pdfIn PDF document text
    • https://nagejezesalu.weebly.com/uploads/1/3/0/8/130874580/xumolasure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379720/normal_6018bd6d01b17.pdfIn PDF document text
    • https://tedevonefuses.weebly.com/uploads/1/3/4/5/134528644/75b199a139d46b.pdfIn PDF document text
    • https://cdn.sqhk.co/lewoxiguj/ijy7gdE/knife_center_military_discount.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/genukopapovixo/posupunit.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/1017687146.pdfIn PDF document text
    • https://s3.amazonaws.com/degisapemifa/ac_dc_all_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/data_obb_avatar_musik_indonesia.pdfIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_7f14a77ac89c43ada13b7e138960916a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wekibik/90707501491.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/couchdb_replication_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/joint_commission_international_standards_6th_edition.pdfIn PDF document text
    • https://de315c38-daa2-4293-b666-e554ba9b7d65.filesusr.com/ugd/564d2e_e7f8a33541c84d2fb6cfcaeeb8cabaed.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/34941728208.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/mazutogumotivadudep.pdfIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_c69713d9324e4f308ae04abffa7452ef.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001057c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057C 5276 bytes
SHA-256: 3429ea80898e5ced9529f93bed5f4635a1ad876df6f0351998b654e228812dbc
font_01_sfnt_off00011757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11757 12376 bytes
SHA-256: 9bc1328488ff85553286d415e623e02ebbb9f0f64f7064cdf1bb4e9b04194a3b
font_02_sfnt_off00013fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FEC 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378