Malicious PDF — malware analysis report

Static analysis result for SHA-256 d601f23443d9b468…

MALICIOUS

PDF

77.4 KB Created: 2021-01-23 19:40:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d7355a3ac5d17bbc1a25f396052a6e72 SHA-1: 3e3ad5084b465b67f7535cc28b991fcfe923466c SHA-256: d601f23443d9b4682ef9d6a0251771a5698e95c2cf46a082da471af9999fae3d
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm and by a machine learning classifier and ClamAV as malicious. It contains numerous external links, many pointing to disposable hosting services, suggesting a phishing or ad-revenue generation scheme. The document body, though heavily obfuscated, appears to contain text related to the embedded links, further supporting the link farm attack pattern.

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://seumenha.ru/123?utm_term=is+oratorio+an+example+of+secular+music PDF link annotation
    • https://jidupedepinamup.weebly.com/uploads/1/3/2/6/132680921/9669032.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496001/normal_5fee77ed2f169.pdfIn PDF document text
    • https://temisufe.weebly.com/uploads/1/3/5/3/135384001/a59f2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481510/normal_5fd11c63c183b.pdfIn PDF document text
    • https://ruxibini.weebly.com/uploads/1/3/2/6/132680870/1045584017d33.pdfIn PDF document text
    • https://mabobuloxulekev.weebly.com/uploads/1/3/4/6/134692970/7528873.pdfIn PDF document text
    • https://perisabirazuro.weebly.com/uploads/1/3/1/4/131437425/niken.pdfIn PDF document text
    • https://zujuwaxi.weebly.com/uploads/1/3/5/3/135307850/3504776.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/gegadomujodi_vizagamaxo.pdfIn PDF document text
    • https://bitujidup.weebly.com/uploads/1/3/4/5/134598072/fegaduri.pdfIn PDF document text
    • https://volufijipezuji.weebly.com/uploads/1/3/4/7/134703795/2904df8c767a5.pdfIn PDF document text
    • https://retariluwefise.weebly.com/uploads/1/3/4/8/134858211/287c925e5e2.pdfIn PDF document text
    • https://jotulamopusojo.weebly.com/uploads/1/3/4/4/134465369/02a9cbe050b6a1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/bulk_rename_utility_portable.pdfIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/povifetopuzekujanagugabib.pdfIn PDF document text
    • https://s3.amazonaws.com/tapelu/jovuvixexarezawuritojapug.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E2 5164 bytes
SHA-256: e286c96350a9c23d5aff3461c5889046f8aedfc573032acbe2f54929fe98a17e
font_01_sfnt_off00010362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10362 10968 bytes
SHA-256: 25b84d045dc4b476c32949c728a68f4e71705106752ae050577b80ecb1be92b5

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