Malicious PDF — malware analysis report

Static analysis result for SHA-256 29406f774a89e4c3…

MALICIOUS

PDF

75.9 KB Created: 2021-06-10 16:27:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 254bb6c21a3c0ff540ac962e54137930 SHA-1: cc661d7ea102f1d0352f56ad639be06c5dca049e SHA-256: 29406f774a89e4c34b5acdecd6dc252f1e7092ca67623b1a0dc31c1884bdad71
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body, though partially corrupted, contains keywords related to downloads and wishes, aligning with a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://archism.ru/pbw?utm_term=happy+new+year+2021+wishes+free+download PDF link annotation
    • https://posokirotol.weebly.com/uploads/1/3/2/8/132814476/nepus-kuxog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494433/normal_5fee9cdd522bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484355/normal_600f2da67c241.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420930/normal_6024c0e676d64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381094/normal_606dd54b73bcd.pdfIn PDF document text
    • https://dimeropudefopo.weebly.com/uploads/1/3/4/7/134742885/rugesuj.pdfIn PDF document text
    • https://jipafopabos.weebly.com/uploads/1/3/3/9/133986828/8481f69a634eb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487005/normal_5febbbacd79d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426953/normal_6033ee9743ef5.pdfIn PDF document text
    • https://severuzilun.weebly.com/uploads/1/3/4/7/134710190/rexirofujemodu.pdfIn PDF document text
    • https://sibomimotilelib.weebly.com/uploads/1/3/4/2/134235458/c28719aba0.pdfIn PDF document text
    • https://sagisumofag.weebly.com/uploads/1/3/4/8/134882066/rojadamamimajevix.pdfIn PDF document text
    • https://fifekususelamib.weebly.com/uploads/1/3/5/3/135349053/703329a4aa34.pdfIn PDF document text
    • https://muwalarole.weebly.com/uploads/1/3/5/9/135959937/b04ef8c9ee.pdfIn PDF document text
    • https://litaxavuve.weebly.com/uploads/1/3/4/8/134848922/2957753.pdfIn PDF document text
    • https://garokeresikiga.weebly.com/uploads/1/3/4/5/134584686/823ce42ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476783/normal_60bd2f8b064b6.pdfIn PDF document text
    • https://faliroralomi.weebly.com/uploads/1/3/0/8/130874474/fc230cf6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/63d6bd79-b1f0-4670-8ba1-40d2787678bb/rolatifozajirilavipibe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0f8c5b3-21ca-478f-9357-b14c2e5e90dd/4963405798.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1dc8ab4d-ce88-46aa-9e94-4c314dd822ae/the_absolutely_true_diary_of_a_part-time_indian_movie.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_off0000ea69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA69 5608 bytes
SHA-256: 061b3569f883147335dcacbeb71a7b168c3310fafa4004a5796466c52ac9d2f3
font_01_sfnt_off0000fd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD99 10516 bytes
SHA-256: fd852967e1c686baefa1e1c132b6e94b60f2b4a7edd088570384ec245886b9e4