Malicious PDF — malware analysis report

Static analysis result for SHA-256 e232e15e44cae0ac…

MALICIOUS

PDF

106.0 KB Created: 2021-03-23 18:43:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28c7391aabf96fbd3d762ff590342ae5 SHA-1: 7d1616af24eb77a72d905c899714ed98e81c48f2 SHA-256: e232e15e44cae0aceaa3fe88c7d5653a7a426d45e2d318dd59a1d321ec4b0034
194 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed for SEO manipulation or to host malicious redirects. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and numerous external links point towards a malicious redirection or download attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=cellulase+production+by+fungi+pdf
    • https://vopezewom.weebly.com/uploads/1/3/3/9/133988608/nusowub.pdf
    • http://vuwefedope.sportsontheweb.net/zaweguwomerutojegala.pdf
    • http://kosamaritaj.getenjoyment.net/12472446823.pdf
    • http://rowowesofazov.medianewsonline.com/basic_physics_problems.pdf
    • http://jonotijero.medianewsonline.com/xivubawasagafuwodatofen.pdf
    • http://mikovil.mywebcommunity.org/sims_3_expansion_packs_download_mac.pdf
    • https://feroredo.weebly.com/uploads/1/3/1/3/131379294/luduzavowijeradamu.pdf
    • http://fukijuwevo.getenjoyment.net/ropirufulatevetonozava.pdf
    • http://xenalebosob.scienceontheweb.net/nofesepawezamoxod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://75ca6b5e-a470-4e0e-8004-b00a9f1721b4.filesusr.com/ugd/1e4819_9af7f6364863416f888ee4135354a257.pdf?index=true
    • https://41c240d9-b4af-4f88-8fa4-2a41cce3a287.filesusr.com/ugd/01bc73_a164ae314dda460395b37a4608b7ba61.pdf?index=true
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_ce02bc68979b4f26b673055f12765a09.pdf?index=true
    • https://459fb65c-52af-4c88-885a-43a44fbeaf25.filesusr.com/ugd/6a7407_6d6f1126eb714aa5846e838c81774461.pdf?index=true
    • http://kuzemepusiloj.onlinewebshop.net/pengertian_bakteri_coliform.pdf
    • http://muluwokixo.onlinewebshop.net/zefevelogo.pdf
    • http://kegigija.atwebpages.com/kosevivepobavisopajoz.pdf
    • https://s3.amazonaws.com/nowokil/96528089096.pdf
    • https://s3.amazonaws.com/xalexojaxipud/lijojixav.pdf
    • https://411563d6-f1a1-4768-9eaa-86e4eb1f1ae3.filesusr.com/ugd/6d8349_ddaac4eed1b549878cf7d811e279ca13.pdf?index=true
    • https://s3.amazonaws.com/fakuguvil/vilawajun.pdf
    • http://bifovigavij.myartsonline.com/97097663613.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015fef.bin
b1fe2842a0b5293c6b90ebc98c5d3575c2d824aa15a2e75eefd6416a01a0b85a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15FEF 5472 bytes
font_01_sfnt_off00017296.bin
8f407234cce0fb642a0466bdc97d0f59b1ac126b993abeae46ca9778ae2644e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17296 12024 bytes

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