Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe6331f766d9258…

MALICIOUS

PDF

69.3 KB Created: 2021-02-25 19:40:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c43d3d6048009298959a197f6b7a0b90 SHA-1: d141cd6aed2b79aae9d9d3c430c69bee02e23d5f SHA-256: bfe6331f766d9258e1181b2356096c973735f3b0a3063ab2e11a186b474b88c8
206 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to contain search query terms, reinforcing the lure of a technical issue. No scripts were extracted, but the presence of numerous external URLs points towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://maypoin.ru/strik?utm_term=hl+2140+drum+error+light+flashing PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388613/normal_5ffb454535c66.pdfIn PDF document text
    • https://xakolino.weebly.com/uploads/1/3/1/4/131453712/97e6dbd.pdfIn PDF document text
    • https://cdn.sqhk.co/tebolugex/hsheifa/old_snake_xenzia_game_online.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/how_to_get_rid_of_best_friend_heart_on_snapchat.pdfIn PDF document text
    • http://3203epworthcres.com/spider_man_comics_reading_guidemu4mb.pdfIn PDF document text
    • https://tesetugunujogub.weebly.com/uploads/1/3/4/0/134040467/7935008.pdfIn PDF document text
    • https://muzafudopabebex.weebly.com/uploads/1/3/4/8/134865208/5664310.pdfIn PDF document text
    • https://cdn.sqhk.co/sanojuxako/chjid9B/85002269362.pdfIn PDF document text
    • http://regvoolkim.website/i_m_going_up_yonder_sheet_musiced1k3.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/zgdOidZ/calcular_iva_16_mexico.pdfIn PDF document text
    • https://cdn.sqhk.co/vuritukupus/fTjjdha/pvpets_tank_battle_royale_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/kosifodalab/RicSpxl/new_ringtones_apps_android.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/Xagf7ih/kizifegoj.pdfIn PDF document text
    • http://newuwedeza.mypressonline.com/57554813918.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://woranuganavot.myartsonline.com/36853898940.pdfIn PDF document text
    • http://ziwemasux.myartsonline.com/4th_grade_grammar_quizzes.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_off0000d236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD236 5696 bytes
SHA-256: 77052cdd9c9072a3cf458f1d52d371607f5fc94f882a5ccfcdbc3771f5141d25
font_01_sfnt_off0000e576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE576 10176 bytes
SHA-256: d5530d91dedb03abaaa19ef42d616d0e116d4725cbc13d7801156d1a68d916c8