Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce9765e801e6dc3d…

MALICIOUS

PDF

73.4 KB Created: 2021-06-03 00:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 054f27d03fefbcfc7b9df07f2e9097cc SHA-1: acf6f46a267d7ac92b3b2c22c1429a07a0ccb69b SHA-256: ce9765e801e6dc3d322cf43c73ddfdb98e34808603ccf92b3403375c8314b3fa
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://maypoin.ru/123?utm_term=employment+exchange+card++manipur PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383156/normal_5fd9c02baaa49.pdfIn PDF document text
    • https://sanupeden.weebly.com/uploads/1/3/5/9/135961416/8985566.pdfIn PDF document text
    • https://karifizamazo.weebly.com/uploads/1/3/1/3/131383674/931501307f25711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481836/normal_5fd900c567137.pdfIn PDF document text
    • https://vebagikag.weebly.com/uploads/1/3/4/5/134522288/98c59fd80e385.pdfIn PDF document text
    • https://xinuluparos.weebly.com/uploads/1/3/0/9/130969110/5c733af.pdfIn PDF document text
    • https://kulazizuwajo.weebly.com/uploads/1/3/7/4/137498773/karekokovugujik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463266/normal_5fc6412aca980.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383132/normal_602f2a23a998f.pdfIn PDF document text
    • https://kugakisan.weebly.com/uploads/1/3/4/3/134390280/pijuvo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413016/normal_6002476c3ec31.pdfIn PDF document text
    • https://peketavapi.weebly.com/uploads/1/3/4/3/134331612/6696966.pdfIn PDF document text
    • https://rudunusom.weebly.com/uploads/1/3/4/6/134602981/xudamex_poxodurevujadas_gibudonikekune.pdfIn PDF document text
    • https://xijuwubime.weebly.com/uploads/1/3/4/2/134234920/8960550.pdfIn PDF document text
    • https://wosobariwosamu.weebly.com/uploads/1/3/4/3/134372044/wewobok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wijozuzapusa.pbworks.com/w/file/fetch/144471012/what_are_the_four_key_performance_indicators.pdfIn PDF document text
    • http://wixugigir.pbworks.com/w/file/fetch/144458892/37084632121.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_off0000e05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05E 5436 bytes
SHA-256: 421620645079ff0a071045c0915e9b5029278a7727c8e2c0e4230c5631dd373f
font_01_sfnt_off0000f2bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BB 11184 bytes
SHA-256: c494ea75f0e3d880d620dbbe7ab3bc986dc1230e3dccb471ad229569fce29840

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