Malicious PDF — malware analysis report

Static analysis result for SHA-256 70fefe7c81bcbf84…

MALICIOUS

PDF

82.7 KB Created: 2021-03-30 10:14:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: acca2207a34431e64310eb7584435342 SHA-1: 18cd9431acf3e047a4a6c64f91e579c5159b9617 SHA-256: 70fefe7c81bcbf8420fdb0682d6ab9b4d886e1813ca13e7c136e0f6f31de06ec
186 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm and SEO manipulation, with numerous external links pointing to other PDF documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful 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://ponafet.ru/award?keyword=convex+mirror+formula+derivation+pdf PDF link annotation
    • https://cdn.sqhk.co/gawagunikuw/0lhcxgT/nosoroxonujegem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450639/normal_60550fffdd8a4.pdfIn PDF document text
    • https://cdn.sqhk.co/pajijolabalu/hhiajen/dekajan.pdfIn PDF document text
    • https://cdn.sqhk.co/dejegekonula/bYSyQia/navudevujumi.pdfIn PDF document text
    • http://2022god.com/yugioh_discard_deck5jxep.pdfIn PDF document text
    • https://cdn.sqhk.co/redusebi/9giwI7T/android_phone_manager_for_mac.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/11661921313bm82z.pdfIn PDF document text
    • http://opssmall.space/who_guidelines_trs_986_annex_2nsxeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462038/normal_605f49e2a8429.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/hbibhgc/87528995614.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://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_d79979e3e7094b34abf09f5ace39c6be.pdf?index=trueIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_6f0e13f57ad244689468f3594d08d0a2.pdf?index=trueIn PDF document text
    • https://b09d99c6-da67-4e55-b5b3-baceba093817.filesusr.com/ugd/a69c6c_e46b3621b57240b9838d4088cf38eee4.pdf?index=trueIn PDF document text
    • https://4c8e72c6-e2e3-4108-adc6-102de481692d.filesusr.com/ugd/f4b4ca_fbdad83ffb054eba8b878753901ffd82.pdf?index=trueIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_a3034876ab484bc3af2e79d565afd3e8.pdf?index=trueIn PDF document text
    • https://b66a6cc6-7028-4fd7-9d19-084b2b27c535.filesusr.com/ugd/4015cf_bc99afea7d6d42758a4741d9b78881db.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D3 5044 bytes
SHA-256: fc470e43187221b3be144ffa79d2de13a485ae2617e7a156612af38d5942c06c
font_01_sfnt_off0000f1e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E6 11644 bytes
SHA-256: 0bb9073c93aeb534145366b6ba66c7501aa7c529bdb9a162e18f99efa06e7c62
font_02_sfnt_off00011a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2C 16204 bytes
SHA-256: a12deed2a6a0044a8c25377610ddbf4ff0701bdc434f61ea76498da2f5af8202
font_03_sfnt_off00012f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F70 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f