Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b9d6c0cb4e9b851…

MALICIOUS

PDF

84.3 KB Created: 2021-02-21 23:44:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 504086171c44350458b60da12b990a97 SHA-1: 29e4e31cb2e71aa05424a0fdd964cda59973d938 SHA-256: 3b9d6c0cb4e9b851e883432cb9d86f70706bdb66344f0a2b5eb7883e0af46781
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are part of a link farm, suggesting an SEO poisoning or phishing attempt. The embedded URL and the PDF's structure indicate it's designed to drive traffic to malicious or deceptive websites. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/wix?keyword=mabinogi+alchemy+guide PDF link annotation
    • http://ibkreactiva2020.com/pregnancy_baby_growth_chart_week_by_weekf2xya.pdfIn PDF document text
    • http://gamedv.design/cancer_de_pulmon_radiografiae2s5a.pdfIn PDF document text
    • http://podipotekoi.ru/one_clue_crossword_answers_word_of_the_daygag7c.pdfIn PDF document text
    • http://uscreditscore.info/wesivetujavobodubakuseg5yr8z.pdfIn PDF document text
    • https://sutiwipuxepol.weebly.com/uploads/1/3/4/5/134517417/ab463.pdfIn PDF document text
    • http://astropsychology.website/como_hacer_un_asador_de_ladrillo_con_chimeneati5qw.pdfIn PDF document text
    • http://lnstagramcopyrighthelps.com/56864614796zshod.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bejexe/mevofew.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/walafilomogepisavufe.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/royal_mail_envelope_size_template.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/porsche_cdr30_manual.pdfIn PDF document text
    • http://lojetejimekatow.rf.gd/80021659004.pdfIn PDF document text
    • http://juruzozesema.epizy.com/washington_state_common_core_standards_art.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_off00010dc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC7 5324 bytes
SHA-256: 3923efa8cdd2e22251773ca8da1ac9866a307f145cee41d4ef744e83faeef41a
font_01_sfnt_off00011fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD4 10720 bytes
SHA-256: 00ff174c84619ed0e8a835e4a0b7a233f8b2ae9211d039d5fc53674ae813901d

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