Malicious PDF — malware analysis report

Static analysis result for SHA-256 12d25017211cac25…

MALICIOUS

PDF

122.6 KB Created: 2021-03-17 16:31:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f101e8ac955cf19806821cb5404adf82 SHA-1: b9ea2ee358de215033a06f4236cfb6edb8ee5185 SHA-256: 12d25017211cac255b9da1840882f93ac75f48040f3bb0bb87f5dbd58bc21131
206 Risk Score

Malware Insights

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

The PDF file contains numerous external links, forming a link farm on disposable hosting, which is a common tactic for distributing malicious content or phishing lures. The heuristic 'SE_CALLBACK_LURE' suggests a phishing pretext, and the ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' confirms its malicious nature. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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) or Microsoft license-boilerplate 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://xajibur.ru/award?keyword=shoprite+specials+pdf+download PDF link annotation
    • https://rasofenetiko.weebly.com/uploads/1/3/4/8/134862321/379313.pdfIn PDF document text
    • https://cdn.sqhk.co/kekelivig/9hQBibj/2020_election_oddschecker.pdfIn PDF document text
    • https://wegejazibeb.weebly.com/uploads/1/3/5/3/135305894/lofuw.pdfIn PDF document text
    • http://55571.ru/kizujiribetegojtle9u.pdfIn PDF document text
    • https://cdn.sqhk.co/zofizitene/gjhgSjf/keep_away_godsmack_live.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabudoxuwa/iieFOLC/xiniduxikasatuf.pdfIn PDF document text
    • http://wudazex.sportsontheweb.net/73278802568.pdfIn PDF document text
    • http://grandov.pro/95194435288vukqa.pdfIn PDF document text
    • https://konilusikiwi.weebly.com/uploads/1/3/3/9/133986353/e9b57d989afa.pdfIn PDF document text
    • http://jelabenix.22web.org/free_sight_word_worksheets_2nd_grade.pdfIn PDF document text
    • http://trujillostacoshop.com/kigedafutoa79g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_a3a83617bde14370bba3476f34ed9c2a.pdf?index=trueIn PDF document text
    • http://faxevimisosideg.myartsonline.com/9834629213.pdfIn PDF document text
    • https://5090cb7a-f7dd-45b7-a4a3-960150b62b23.filesusr.com/ugd/dfd4af_257f6ba7b6934fcd999d23505b2bb08a.pdf?index=trueIn PDF document text
    • http://sisuraregimu.rf.gd/brawl_stars_mod_apk_v_15._169.pdfIn PDF document text
    • http://durenifujogax.myartsonline.com/penyakit_anthrax_pada_sapi.pdfIn PDF document text
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_ef8da39b9ad64a0f814e09d329ada189.pdf?index=trueIn PDF document text
    • http://suvoxezol.rf.gd/how_do_i_write_a_real_estate_purchase_agreement.pdfIn PDF document text
    • http://metusajixano.epizy.com/lefimofififoruzodix.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_off0001a546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A546 5440 bytes
SHA-256: a75a2ec4c0e901e58fb879b61cfb7f332b9abfc4648953f1696bc26218d67750
font_01_sfnt_off0001b7d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B7D1 10984 bytes
SHA-256: ac07a562520729daeefd994e1012e41f742510756993809abbefe97753f42540