Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cb0186426882129…

MALICIOUS

PDF

76.6 KB Created: 2021-02-01 05:56:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 284947edadb75912b69c02da30224d44 SHA-1: 98be3120aa916752f4e2c0934c5670c751a707f2 SHA-256: 3cb01864268821290f75fcb1bede8989a0d63f823bd22a32f73bc20b68cdb54e
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting it is part of a link farm or phishing campaign. The presence of a URL with 'utm_term=butterfly+chair+covers+amazon' indicates a deceptive lure to drive traffic to potentially malicious sites. ClamAV and ML classifiers also flagged this PDF as malicious, reinforcing the phishing and potential malware distribution intent.

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://baarspo.ru/123?utm_term=butterfly+chair+covers+amazon PDF link annotation
    • https://bigififipajug.weebly.com/uploads/1/3/4/7/134709095/4a170f016c.pdfIn PDF document text
    • https://bizugejukuvav.weebly.com/uploads/1/3/4/3/134322279/13ecf946de09.pdfIn PDF document text
    • https://soluvixam.weebly.com/uploads/1/3/0/8/130873975/robinefesoriwe-fulugazok.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/jgD5nzn/bossy_ball_4.pdfIn PDF document text
    • https://jasujoru.weebly.com/uploads/1/3/1/4/131483343/fimijen_radixomowopiben_sumew.pdfIn PDF document text
    • https://cdn.sqhk.co/dojerilu/ggohjHz/womavedijuratexug.pdfIn PDF document text
    • https://cdn.sqhk.co/josurowelimu/Phcif1J/feteva.pdfIn PDF document text
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/2ee8fa0c3ae88.pdfIn PDF document text
    • https://nezozavigarej.weebly.com/uploads/1/3/4/7/134727028/cf7cf73e0f2a40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423428/normal_5ff6162267285.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4530846/normal_5fdba930efa3a.pdfIn PDF document text
    • https://cdn.sqhk.co/tesolivu/jbbhyHM/granny_square_sweater_vest.pdfIn PDF document text
    • https://dofixojibol.weebly.com/uploads/1/3/0/8/130874360/a7312.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ec45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC45 5380 bytes
SHA-256: 316d3b4d015f71db60a898227cac8a36b312bf5246c8b5560ff9e3eea7a282f1
font_01_sfnt_off0000fe81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE81 11444 bytes
SHA-256: 328ae7a896baf0ca57353df8e3f137668b883020cfbccba8c575ae7b83576970

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