Malicious PDF — malware analysis report

Static analysis result for SHA-256 645c1072a6eabaac…

MALICIOUS

PDF

84.0 KB Created: 2020-12-27 00:47:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5082f22cfbdb974bad48428dc42350bd SHA-1: b2029ae4640408ada186e52c2f3488df37cc772b SHA-256: 645c1072a6eabaacec1a779d117b0004da4fcd44633783d4acc56ade61576467
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on Weebly and f-static.net, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious content designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • 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://trafftec.ru/123?utm_term=the+goblet+of+fire+pdf PDF link annotation
    • https://babipuwoze.weebly.com/uploads/1/3/4/8/134865032/48061.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386336/normal_5f903785720d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366406/normal_5fe3a2cd63cd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495686/normal_5faa28b322d8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367005/normal_5f874ee13eb2d.pdfIn PDF document text
    • https://bufodenoziro.weebly.com/uploads/1/3/4/5/134585066/gujob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367308/normal_5f876ee4b1a92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370777/normal_5fcd5dc22314b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493282/normal_5fb2da4b2f6cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496616/normal_5fc0241399e1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388596/normal_5fb0177f1be65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378606/normal_5fbd840d14671.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://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_off0000ff25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF25 4684 bytes
SHA-256: e03de663ffe89b9a712c274c511a8459253906cd9e92cd6d4d8e84b15e10b5d9
font_01_sfnt_off00010f27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F27 11156 bytes
SHA-256: f1e3c13935a02e13c8bc0baf943f56a15f6fe95e21c29cb63598609ba0555ba3
font_02_sfnt_off00013502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13502 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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