Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e9131dee645e9f…

MALICIOUS

PDF

100.4 KB Created: 2021-02-28 12:30:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a80be524ee73e52836c32aadbb8c1c85 SHA-1: c6ca385754cc26296b8f5ba2ac5d4de79c884b51 SHA-256: 81e9131dee645e9fbfe04e2a8aeebcafe82bd9d96f17bb7cc46f889020e1462d
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, suggesting a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://dafemum.ru/strik?utm_term=quadrilaterals+and+coordinate+geometry+worksheet+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4465905/normal_5ff52125bb53b.pdfIn PDF document text
    • https://cdn.sqhk.co/zejejofe/U4Xgfji/barure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426697/normal_600cc5036117c.pdfIn PDF document text
    • https://zopixidasopotid.weebly.com/uploads/1/3/1/3/131397955/b7ec5ccc372a.pdfIn PDF document text
    • https://cdn.sqhk.co/letareximo/bjgihFx/nomazujeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484834/normal_5fd14900310a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384160/normal_6031bb6dcaef2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408176/normal_5ff16de8e8624.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379742/normal_5fe975c32844a.pdfIn PDF document text
    • https://tuvugeti.weebly.com/uploads/1/3/4/1/134108896/5110ed.pdfIn PDF document text
    • https://cdn.sqhk.co/wiwuwigo/dxPhha6/walmart_neighborhood_market_springfield_mo_mt_vernon.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/budovewesekaz/principles_of_ecotourism_according_to_ties.pdfIn PDF document text
    • https://s3.amazonaws.com/gajabedafot/facebook_apk_latest_version_2019.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_off000149d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149D1 5672 bytes
SHA-256: 53ae8ccda1f556a31b33c2552a3c9f17eed0e361df4cc06f8a30e57e7acc1f69
font_01_sfnt_off00015d0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D0E 11464 bytes
SHA-256: 17e7a50ddb6db9d258aacd96331101fa87801da7363a57b22f5ef462db5ac064

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