Malicious PDF — malware analysis report

Static analysis result for SHA-256 71af91687ecfd53e…

MALICIOUS

PDF

69.4 KB Created: 2021-02-16 06:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0da78d44abd0db0fecb067dbc67554c2 SHA-1: 902f4b958316de3837642460638db98d6391ca2a SHA-256: 71af91687ecfd53e2bc4884b765f65eb7197429ab662cdbaa20c9ff34999294b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://jacksth.ru/strik?utm_term=romeo+and+juliet+act+2+summary+video PDF link annotation
    • http://sewaseg.22web.org/dell_vostro_1500_ram_specs.pdfIn PDF document text
    • https://cdn.sqhk.co/vonirosidejo/Rptkjjj/94671262755.pdfIn PDF document text
    • http://tehnotop.site/13266537713b5luy.pdfIn PDF document text
    • https://jebezijako.weebly.com/uploads/1/3/5/9/135964749/7bcf0ade7e.pdfIn PDF document text
    • https://lamipakowoj.weebly.com/uploads/1/3/2/8/132814468/jogikiji.pdfIn PDF document text
    • https://zibekasosux.weebly.com/uploads/1/3/4/0/134040395/paxizevetabizu_juxorafetedura_nufus.pdfIn PDF document text
    • https://fomiradoxep.weebly.com/uploads/1/3/4/5/134512134/lanovabapalolipe.pdfIn PDF document text
    • https://pebezudaxefen.weebly.com/uploads/1/3/4/3/134347708/lazagaxizisux.pdfIn PDF document text
    • https://cdn.sqhk.co/kegufamop/2gcXiJ0/battlefield_4_commander_download_android.pdfIn PDF document text
    • https://cdn.sqhk.co/runolisor/ejgQKcE/buwusuwuwomade.pdfIn PDF document text
    • https://cdn.sqhk.co/xogatijixe/dhhhbqh/67146569514.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/buponuwebi/60640826236.pdfIn PDF document text
    • http://dobupefibukin.epizy.com/37016312938.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/32093848795.pdfIn PDF document text
    • http://luruloligof.rf.gd/ketchapp_basketball_game_uptodown.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/93113413548.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_off0000d2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2DE 5460 bytes
SHA-256: 376cd4d7c54848e690ba30fdd69578cb16df482b6c2b93c6b3f5d067688c9177
font_01_sfnt_off0000e570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE570 10360 bytes
SHA-256: 7f257bb86345cdb9697591ed9706f8c5c2b1870060aba36d78bf83e035aa8c9b

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