Malicious PDF — malware analysis report

Static analysis result for SHA-256 a689ca1b7aad5941…

MALICIOUS

PDF

96.0 KB Created: 2021-03-31 02:42:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8da2caebb5cf33dacc7a2ee7837bec0f SHA-1: b5859f4dea545fc8ecf929c884f5dbabae9bbb6e SHA-256: a689ca1b7aad5941189f8f835ba7f23870d7d4fffb4f688d8ccd90fc325cd210
176 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, with heuristics indicating it contains a large number of external links, potentially for SEO manipulation or phishing. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pattern, where the user is prompted to call a number. While no scripts were explicitly extracted, the PDF structure and heuristics suggest it's designed to deceive users into initiating contact, likely leading to further social engineering or financial fraud.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=sigma+1200mm+tile+cutter
    • https://mabanopovofed.weebly.com/uploads/1/3/1/4/131453130/gedewepuraraw-kamabikidadeg-luwomalefo-pidixofofusoj.pdf
    • http://barajofa.mywebcommunity.org/managing_political_risk_in_international_business.pdf
    • https://jigaxokere.weebly.com/uploads/1/3/4/6/134622899/popef.pdf
    • https://xebolefijepipol.weebly.com/uploads/1/3/0/7/130739937/gowadumel.pdf
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/7efb9c834d3.pdf
    • https://jupepirime.weebly.com/uploads/1/3/4/3/134313464/didos_milirop.pdf
    • http://kapabifidi.sportsontheweb.net/intoxicacion_fenobarbital.pdf
    • https://cdn-cms.f-static.net/uploads/4418175/normal_5fd8b89b007f4.pdf
    • https://delimilakemasuj.weebly.com/uploads/1/3/4/4/134400920/f7b0520dbf.pdf
    • http://rusewigojubilon.mygamesonline.org/dujamodozozibojel.pdf
    • https://rixafivi.weebly.com/uploads/1/3/1/3/131380000/9977853.pdf
    • http://tuduvodakep.mypressonline.com/french_to_english.pdf
    • https://static.s123-cdn-static.com/uploads/4406241/normal_5fc6c2f0264eb.pdf
    • http://vuvulusigi.scienceontheweb.net/wegisukuxij.pdf
    • http://xogunajeraxuda.mywebcommunity.org/4540296608.pdf
    • http://kamikofonem.mygamesonline.org/81597345403.pdf
    • https://visufevulun.weebly.com/uploads/1/3/4/3/134310134/nulupevobap_xowesirirovi_nalozufa.pdf
    • http://xelasurugopu.mywebcommunity.org/waketosimoxisidazawuk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zarevizebi/75013682138.pdf
    • https://s3.amazonaws.com/jawusawar/bescherelle_la_conjugaison_pour_tous.pdf
    • http://zijiwaras.onlinewebshop.net/wewefuwidafezum.pdf
    • https://s3.amazonaws.com/kefefetafij/wezepebovanoruk.pdf
    • https://s3.amazonaws.com/goneduzum/ce_certified_full_form.pdf
    • https://s3.amazonaws.com/rovikibixu/hp_deskjet_2132_printer_driver_for_windows_7_64_bit.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000121b6.bin
fc64428f51ab72140c065186a867ca28e797801421da62258960d051e6d3be0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121B6 5368 bytes
font_01_sfnt_off000133e9.bin
85413dca7dd21bccca1a9d6a3f14349e02fcbeb2bab758f40bd2bea1687892a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133E9 11996 bytes
font_02_sfnt_off00015ce7.bin
73bb1f519e29941fc98367ae33a8b679223d41029fbf73fb5c585da9ec8c2502		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15CE7 16204 bytes

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