Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a602b578648e837…

MALICIOUS

PDF

78.8 KB Created: 2021-03-07 07:20:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5063b9025e08a555badc88330be05d4a SHA-1: e4ccdbd5bf7ac9729acc427748fb7cc3194d90a4 SHA-256: 1a602b578648e837be399e456cf690866624515ea332f6ec9136fe82feb11d90
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with the primary lure being 'bass guitar music theory pdf'. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially malicious or scam-related content hosted on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://jumiwimov.ru/123?utm_term=bass+guitar+music+theory+pdf
    • http://dommasters.site/29243806133phm7i.pdf
    • http://bamejudodenor.iblogger.org/97909460066.pdf
    • https://duzejuwilana.weebly.com/uploads/1/3/4/8/134879611/724523.pdf
    • https://cdn.sqhk.co/fakodozug/gjjaEja/dirupavopemosemezesuwul.pdf
    • https://maxubuzidam.weebly.com/uploads/1/3/4/4/134486229/dirapeburolamigufapu.pdf
    • https://gaxezoxo.weebly.com/uploads/1/3/0/7/130776828/zemeni.pdf
    • https://mufobasigawovog.weebly.com/uploads/1/3/5/3/135344062/3daa76e917c.pdf
    • https://fomunova.weebly.com/uploads/1/3/4/6/134684458/289234.pdf
    • https://cdn.sqhk.co/jinubodilev/diaibjb/super_sonic_the_hedgehog_game.pdf
    • https://cdn.sqhk.co/wadebekop/e8id5Pb/36076897779.pdf
    • https://cdn.sqhk.co/waxipefimafa/ORifrge/baby_shark_dance_world_record.pdf
    • http://lebepufu.mypressonline.com/56667229798.pdf
    • http://mybestchan.online/vamamagudokivukizavalazuws2gt2.pdf
    • http://liwurivosopap.medianewsonline.com/metodologia_de_la_investigacion_cientifica_sampieri_ultima_edicion.pdf
    • http://xafopawiki.medianewsonline.com/sql_for_data_science_edx.pdf
    • http://zonerokemub.getenjoyment.net/66444732649.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://guxajofiv.epizy.com/96276145663.pdf
    • https://s3.amazonaws.com/bezorito/36033966196.pdf
    • http://pukokudew.epizy.com/digraph_sds_sheets.pdf
    • https://s3.amazonaws.com/kesumasaka/apowermirror_android_sound.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5f0.bin
2a209c571b1f8f81e8dfdfdd3607c4d241f9922c4281bf0571bc7a9d8c2b141d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F0 5688 bytes
font_01_sfnt_off00010930.bin
001f5f898707904c74565157b30af14f14850fd1508fb233eed065357926b552		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10930 10828 bytes

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