Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bfb9483c183c26d…

MALICIOUS

PDF

77.5 KB Created: 2021-02-25 13:09:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: b4d214eef2a0ae686ce5430d79557fb6 SHA-1: 2ad125d87bcdcfd79c84f4bbe4f7440159fb079a SHA-256: 7bfb9483c183c26d6b0736019fdb3f5582cf94b00f1a295dde8edfff8770ed8d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO spam operation. The embedded URLs likely lead to phishing or malware distribution sites. No scripts were extracted, but the PDF structure itself is used to host and link to malicious content.

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 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://bologen.ru/award?keyword=cuisinart+food+processor+dice+vegetables PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4451556/normal_60062bc51eece.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530937/normal_5fcd8ea6a2e5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375887/normal_5fe8ec5a21820.pdfIn PDF document text
    • https://karifizamazo.weebly.com/uploads/1/3/1/3/131383674/887264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473640/normal_602c6bbbdbe6c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385026/normal_5feb3fb7687cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386089/normal_5fe74ec6d11fa.pdfIn PDF document text
    • https://cdn.sqhk.co/lifudidu/95wAw7Q/siberian_tiger_eating_bear.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377674/normal_5fe1f77c3687e.pdfIn PDF document text
    • https://jezuvafu.weebly.com/uploads/1/3/5/3/135348480/sewebixipu-xalowavif-zamos.pdfIn PDF document text
    • https://cdn.sqhk.co/fafaviwi/du3iijc/12018513696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446633/normal_5fda724142388.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402533/normal_5fd0af4db9ad2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479921/normal_5ff1adf7b9d13.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/rekawexuretowo/76247234718.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_off0000e487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE487 5428 bytes
SHA-256: 5295d7fea26f5e3fcb3ea0ff5377b99735a67d5fc77cd812fb7ac3655fb00ccb
font_01_sfnt_off0000f709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF709 10368 bytes
SHA-256: eca9c19f45ec219b589e1acbf32f48e8e7a30ef7fc1887006e484c52d7b197b4
font_02_sfnt_off00011a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A85 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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