Malicious PDF — malware analysis report

Static analysis result for SHA-256 74f036c612e5ba56…

MALICIOUS

PDF

80.7 KB Created: 2021-02-19 13:40:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 21ec5d381ddf157a865b072b5145512f SHA-1: 56627804084f283831a7b2073130e05587c1f44b SHA-256: 74f036c612e5ba56522875742f73d4a7abc71eef276e37a38342d1b2d3239e09
186 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=how+tall+is+mr+darcy+in+pride+and+prejudice PDF link annotation
    • https://pajuxosam.weebly.com/uploads/1/3/0/9/130968950/6051917.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501656/normal_60261a0ebd51a.pdfIn PDF document text
    • https://zipusuborulam.weebly.com/uploads/1/3/0/8/130814510/vaxusewixulorox-vugikitubafi-jusopagatinimom-nuvem.pdfIn PDF document text
    • https://paxolobiwoke.weebly.com/uploads/1/3/1/1/131163878/fb44938fc99d8.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/tetuzivix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411489/normal_5fe85694bdfff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366653/normal_5fd08f10ce0eb.pdfIn PDF document text
    • https://gilurumujeluzem.weebly.com/uploads/1/3/1/8/131857598/lulabujerarisowu.pdfIn PDF document text
    • https://bufaxivija.weebly.com/uploads/1/3/1/3/131383981/fejolizi.pdfIn PDF document text
    • https://xowiwive.weebly.com/uploads/1/3/1/3/131398234/e2a1a.pdfIn PDF document text
    • https://bivofeneduwid.weebly.com/uploads/1/3/1/1/131163561/kowibejivijezogitevo.pdfIn PDF document text
    • http://govnosiakxws.online/5053443549ifkgi.pdfIn PDF document text
    • https://nonexivibofopuv.weebly.com/uploads/1/3/4/6/134603010/334845.pdfIn PDF document text
    • https://xidoxuzi.weebly.com/uploads/1/3/4/7/134707988/jonutazemazu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454182/normal_6026a390e5ea2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501495/normal_60021f0bdb910.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_off0000fd9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9F 5448 bytes
SHA-256: bab4ec2e115e7453e89ba540f79aef3db47896d4b4f9a7fe1aed0ad09560eb6f
font_01_sfnt_off00011027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11027 11096 bytes
SHA-256: 8eef87a584f106e420c8d69202043f8847f59df264e777a044f449e6802d156d

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