Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03754511687c865…

MALICIOUS

PDF

74.0 KB Created: 2021-03-27 17:26:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 2ed436f5676d24f8784520b1cdb49334 SHA-1: b04fd0a678ce46148d788768392beb781e5404ef SHA-256: a03754511687c8658690f792737b858a9caa05079c5eaf58a07e2802183efb49
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to disposable domains. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the presence of many external links suggests an attempt to redirect users to potentially malicious websites, possibly for SEO manipulation or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://zajinet.ru/123?utm_term=muzzle+flash+video PDF link annotation
    • https://redobalopubijav.weebly.com/uploads/1/3/1/3/131380120/vukonefelafog-mimutuzorizag.pdfIn PDF document text
    • https://kagepejipewabo.weebly.com/uploads/1/3/4/8/134871264/6ca262b2ef8250.pdfIn PDF document text
    • https://fogorito.weebly.com/uploads/1/3/5/3/135322632/jamufozeno.pdfIn PDF document text
    • https://kanumipiga.weebly.com/uploads/1/3/5/3/135346224/jujokukulivu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467560/normal_602f4d01b88b6.pdfIn PDF document text
    • https://suridivulav.weebly.com/uploads/1/3/5/3/135312357/d6d05a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387698/normal_5fefc9aeaca9b.pdfIn PDF document text
    • https://wutupebepa.weebly.com/uploads/1/3/3/9/133997315/156197.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://kopajadipovagu.rf.gd/97890873713.pdfIn PDF document text
    • https://fa90eb46-aa9b-4fd1-a2e8-e903ec8e50a4.filesusr.com/ugd/575fb0_1c68216b8d7d45b1a64541458f21b4bf.pdf?index=trueIn PDF document text
    • http://ropolawurafur.epizy.com/tuzeluraz.pdfIn PDF document text
    • http://wafapajof.epizy.com/stickers_en_apple.pdfIn PDF document text
    • http://fudapigoxuwumu.rf.gd/gesatewu.pdfIn PDF document text
    • https://fdb0147f-387d-4908-9c93-1ccdb5bf775f.filesusr.com/ugd/aea2e0_5881f8b275d641aaade1c5228538d013.pdf?index=trueIn PDF document text
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_fefc8a74bb8745d797062e64e7645978.pdf?index=trueIn PDF document text
    • http://piwuzodoxomox.epizy.com/insects_worksheet_for_nursery.pdfIn PDF document text
    • https://f3b86e06-b3aa-4ee1-82f7-79049f3379a8.filesusr.com/ugd/0c4fd2_a2b2e3377e724b95b63c0aa96f7772c8.pdf?index=trueIn PDF document text
    • https://9cf93ecd-64ee-4ad6-afcc-f350577a7522.filesusr.com/ugd/c4dbd3_cdd789fe07de477fb70aec0640e3f20f.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F1 4708 bytes
SHA-256: b0a29910a0f464340873cecfddd0da67a00d13a428b87d4df416adc26293d071
font_01_sfnt_off0000e612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE612 12800 bytes
SHA-256: 356e6036d583773d85ed58c7f6e8902e2c99caf8271b190aae22a2cbf6ed7378
font_02_sfnt_off00010cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEC 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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