Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba4009271f16110…

MALICIOUS

PDF

72.8 KB Created: 2021-03-07 10:51:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ce908d1ed01bd9a3f9a566a677fb694c SHA-1: b167ea6f137ed70646dc33166a30065d65fe0b92 SHA-256: 7ba4009271f16110201f8f3625bfe88ff5d273977421d4c3850eca8e12b33f37
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable hosting, indicative of a link farm or phishing operation. ClamAV detection and ML classification strongly suggest malicious intent. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the attack pattern of directing users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/strik?utm_term=fluke+175+price PDF link annotation
    • https://cdn.sqhk.co/segenapiza/iaijid1/59540771541.pdfIn PDF document text
    • http://clobuss.ru/post_stroke_seizure_treatment_guidelines81zzt.pdfIn PDF document text
    • https://pudasebedizut.weebly.com/uploads/1/3/4/5/134587980/vokixogugez_bupusupisalokud_lidib_misakevujunakis.pdfIn PDF document text
    • https://cdn.sqhk.co/disumuneriva/7icaaH3/basic_marketing_strategy_of_products_ppt.pdfIn PDF document text
    • https://cdn.sqhk.co/pifizumux/QUxqYjj/61385808654.pdfIn PDF document text
    • http://devlp.design/towoxonimejebeslmzei.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385014/normal_5ffbb818ca18d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383302/normal_600beb319faa8.pdfIn PDF document text
    • https://cdn.sqhk.co/jolodovi/iekgen0/15080357554.pdfIn PDF document text
    • https://nawivavunof.weebly.com/uploads/1/3/4/6/134669961/27f74e34d66d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527108/normal_6011563fcf081.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dd907c4b-492b-4b4d-bf3c-9f0b7a2bd2c7.filesusr.com/ugd/96a426_e18cd056244045b5857aa501c97dfc69.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ruzumeb/sadotidodilivimo.pdfIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_473bb857803143879a9b15a54408a2d7.pdf?index=trueIn PDF document text
    • https://9df6fdd8-df71-43fb-87ad-b121b2de7416.filesusr.com/ugd/e0d0cf_5374f1c14c4649b9bc3e2890cfe167fa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/satedafadusizo/putaxizera.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

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE90 4816 bytes
SHA-256: 0db96136a9a82f6e491fd753e3f550553be1d31d18d0a40a47cc46fcbf8a0eb6
font_01_sfnt_off0000ef19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF19 11604 bytes
SHA-256: 14d21b252875e6aad7d07b488941962dbbb413b65b66154fcbe638924eb95376

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