Malicious PDF — malware analysis report

Static analysis result for SHA-256 3649659b68828a5d…

MALICIOUS

PDF

80.2 KB Created: 2021-05-08 23:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f895ed8270995fb2aa6d79ada797c223 SHA-1: 247e75d9661dce0a05aa89298a9b20f406a4bbe7 SHA-256: 3649659b68828a5da3ba3db5931b8e013f60739eb9dcba8eef9948f5ef615f8f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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=washington+redskins+new+name+news PDF link annotation
    • http://sayfelengs.space/kejegewodisobubabuny6mc.pdfIn PDF document text
    • http://2220202.ru/84842923328oq6xb.pdfIn PDF document text
    • http://copyrightsupport-ig.com/9067187172dwwj3.pdfIn PDF document text
    • http://tapavinologo.mygamesonline.org/4233105151.pdfIn PDF document text
    • https://binigikuvoloxog.weebly.com/uploads/1/3/5/3/135332024/minol.pdfIn PDF document text
    • http://itawegan.space/scary_movie_1_download_dual_audioogb74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366676/normal_5fd96924e085b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461481/normal_603d03ff13b7d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385633/normal_6043069789993.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370074/normal_604d40cca1738.pdfIn PDF document text
    • http://viwesisikumebi.getenjoyment.net/istoria_comunismului_romanesc.pdfIn PDF document text
    • http://mobufuwiwid.medianewsonline.com/42987302702.pdfIn PDF document text
    • https://roxagidu.weebly.com/uploads/1/3/4/7/134748987/6cdd4e66fb.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://luvetux.myartsonline.com/genetics_mcqs_book.pdfIn PDF document text
    • http://sobojagi.epizy.com/vermont_castings_intrepid_1.pdfIn PDF document text
    • http://kuxubakelixuzot.atwebpages.com/balcony_grill_design_catalogue.pdfIn PDF document text
    • http://jigiwema.epizy.com/html_tags.pdfIn PDF document text
    • http://xojixitutatafu.epizy.com/20373120488.pdfIn PDF document text
    • http://balesalefune.epizy.com/warhammer_40k_betrayer.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_off0000f058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF058 5164 bytes
SHA-256: e0a198832b0d328125364d88b5ecfc3a408eb94be124f1faf6cff91ef5d401f8
font_01_sfnt_off000101c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C7 10468 bytes
SHA-256: e27e88da6f9babcdcb0b948ada33f0c5ed2ea8bda1655121829ef41d035d00f9
font_02_sfnt_off000125bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BD 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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