Malicious PDF — malware analysis report

Static analysis result for SHA-256 844a2ed77b7de89b…

MALICIOUS

PDF

68.2 KB Created: 2021-03-25 12:50:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d168db944da23316e8b4531217231b48 SHA-1: 71ebd70f160b6871dfd73fd99e123ce104588ca5 SHA-256: 844a2ed77b7de89bd84eba528416ae91c8cbf08b11d0dbcff044b257e0ce164a
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/123?utm_term=buick+lacrosse+2015+manual PDF link annotation
    • https://xuvurabog.weebly.com/uploads/1/3/2/6/132696285/40b069ec7.pdfIn PDF document text
    • http://nuveclovet.xyz/curso_marketing_redes_socialeslyp8x.pdfIn PDF document text
    • https://javemutamutog.weebly.com/uploads/1/3/4/6/134638327/kusipik.pdfIn PDF document text
    • https://mefifusefom.weebly.com/uploads/1/3/4/2/134266023/1eada788600120.pdfIn PDF document text
    • http://216tilford.com/how_do_i_update_my_tivo_softwarevjj6x.pdfIn PDF document text
    • http://the-job.ru/824883828536awxt.pdfIn PDF document text
    • https://donedujawag.weebly.com/uploads/1/3/4/3/134315137/lavavuxa.pdfIn PDF document text
    • https://diwetisaxuj.weebly.com/uploads/1/3/4/8/134875536/gamovabuwani.pdfIn PDF document text
    • http://pokemonrivals.online/hamlet_by_shakespeare_summaryjwdnl.pdfIn PDF document text
    • https://womegirig.weebly.com/uploads/1/3/4/5/134506381/temobebiwizizatadazo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://satuzolo.epizy.com/b._ed_admission_form_in_ignou.pdfIn PDF document text
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_428bea31a2f64e00ab6e0c31ab1cc5db.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kovezodepugov/jivaxiduwokusoberekejif.pdfIn PDF document text
    • http://wilobinej.epizy.com/insinkerator_evolution_essential_installation_instructions.pdfIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_b376543d291b45da9c8d1a275a5a8e38.pdf?index=trueIn PDF document text
    • http://zesinav.rf.gd/ninja_300_service_cost_india.pdfIn PDF document text
    • https://s3.amazonaws.com/lusabifef/9658074888.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_off0000cb2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2F 5508 bytes
SHA-256: fb95b30435855b71639eacb821bfd1161e187b0cd5c460f41a48417e4871a4e6
font_01_sfnt_off0000dde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE0 10712 bytes
SHA-256: 18a6ef3f2da47c83bca0185c4c01aa3c965b3c33836ccbcf41d140a8501ab0db

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