Malicious PDF — malware analysis report

Static analysis result for SHA-256 39a55349a472bcec…

MALICIOUS

PDF

81.3 KB Created: 2021-02-27 21:14:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8fe031e6effb6bf5273e48b493146125 SHA-1: 30476bed796e5eca59cdcc468bb4e33bff46210d SHA-256: 39a55349a472bcec1c3153630c816f0b59da01acb19212f69744c6b5145ea2b9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and link farms, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to direct users to malicious websites. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to deliver second-stage payloads or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://bologen.ru/strik?utm_term=toro+timecutter+mx5000+price PDF link annotation
    • http://studytogether.fun/71759540794gr5zg.pdfIn PDF document text
    • https://gozezitigaja.weebly.com/uploads/1/3/4/3/134340412/6679738.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416665/normal_603a5682f07eb.pdfIn PDF document text
    • http://lojapidabud.mypressonline.com/c_primer_5th_edition_review.pdfIn PDF document text
    • https://kerumeso.weebly.com/uploads/1/3/4/6/134641164/tapumuxuwipoxe-gujivilidu-gupuzexubiziwo.pdfIn PDF document text
    • http://tortomsk.ru/wefukijatexoy2lxv.pdfIn PDF document text
    • https://razebefalokugex.weebly.com/uploads/1/3/4/8/134895215/b5b63013f9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477910/normal_6006a4e3947fe.pdfIn PDF document text
    • http://lumobumekola.getenjoyment.net/should_internet_be_capitalized.pdfIn PDF document text
    • http://mesretly.xyz/faxosatanedimipuzamimu6ofe7.pdfIn PDF document text
    • http://navalny.design/golexezedebipemexoda24pzt.pdfIn PDF document text
    • http://hookup754.fun/gmail._com_freed7d16.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
    • https://s3.amazonaws.com/zaxefemebidaz/57447962824.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/corporations_canada_annual_return_form.pdfIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/cricket_tournament_invitation_email_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f37f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37F 4716 bytes
SHA-256: b235f194ab13d706c21754ce8a83987f29183fa10f87c33c532cf6875d920de4
font_01_sfnt_off00010396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10396 11404 bytes
SHA-256: a8f8619fa70c56b28fe7f49423b29d7f6bfd31e45a336674c6f7cb4dff8d7d11
font_02_sfnt_off00012a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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