Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e6b9172e2802a7…

MALICIOUS

PDF

85.5 KB Created: 2021-04-10 10:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 80ea0c1161a6500362c9dc0cd697440e SHA-1: 23df79bdecea172886e973e35c7f9e294944ef04 SHA-256: 41e6b9172e2802a7e5f5c21c76011d337cf0491578e7311bef14487c4319829a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://crophysi.ru/strik?utm_term=bose+sounddock+series+ii+remote+not+working PDF link annotation
    • http://ruxuzosok.mywebcommunity.org/83482204959.pdfIn PDF document text
    • https://fexowisidirap.weebly.com/uploads/1/3/4/8/134868585/4125973.pdfIn PDF document text
    • http://rawitotizoxuk.scienceontheweb.net/24312095233.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408336/normal_5fcd6c66c388b.pdfIn PDF document text
    • https://generixa.weebly.com/uploads/1/3/5/3/135350481/6e29664649c6.pdfIn PDF document text
    • https://fobaxidoxeg.weebly.com/uploads/1/3/4/3/134356333/runitu.pdfIn PDF document text
    • http://kavademive.sportsontheweb.net/13128783785.pdfIn PDF document text
    • https://sobopagugakevul.weebly.com/uploads/1/3/4/8/134881985/jivew-wolidiwewesil-lamebitoraba.pdfIn PDF document text
    • http://gizesodawesiv.mywebcommunity.org/algorithme_et_programmation_en_python.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448549/normal_605af6c38be17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383925/normal_5fd61134abaf8.pdfIn PDF document text
    • https://xuwekakef.weebly.com/uploads/1/3/1/8/131856316/rokemufegaxujob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_da0cab3b57e94c6ebbe1f3abf619214f.pdf?index=trueIn PDF document text
    • http://liroporuki.myartsonline.com/online_banking_services.pdfIn PDF document text
    • https://03df74f7-894d-4c84-999e-da2b33eb06f5.filesusr.com/ugd/4c7733_73183999991648cab11a3ac4d5478b69.pdf?index=trueIn PDF document text
    • https://68a74d12-89ac-4a94-b826-09ad332a30bf.filesusr.com/ugd/1a0392_68ef898f1cf84a49b5598818dcb4c5df.pdf?index=trueIn PDF document text
    • https://be08d7d4-326a-4801-be9d-4496af17a43b.filesusr.com/ugd/d31907_90e7d1e62fe84ff2825057d08f0372c3.pdf?index=trueIn PDF document text
    • https://e0bfa911-60eb-4c53-bd8d-ceec25156dfb.filesusr.com/ugd/0a052f_bb66ebbcc28a4461bedaeaec5d46dd37.pdf?index=trueIn PDF document text
    • https://1a6c606f-1efd-495f-9370-57f425d809fd.filesusr.com/ugd/1be480_fedf78ac797d4e78b9d892ffc771bf19.pdf?index=trueIn PDF document text
    • http://sogoxutagejuno.atwebpages.com/84203249813.pdfIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_8ea821294fd944eb89366a85ad233ce3.pdf?index=trueIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_5e3b4cd839134a658eaa801a2ed7e06c.pdf?index=trueIn 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_off00010e23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E23 5224 bytes
SHA-256: 21e3940e68080f6648afaa8366cce86e1974efcd45fbf362f81c68e35ed3eb6e
font_01_sfnt_off00011fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FED 11424 bytes
SHA-256: 45e909aa8bd9718948c9e87c53937676d55f5a12914e83ee3d70a5ee2ace300f