Malicious PDF — malware analysis report

Static analysis result for SHA-256 817211d66420f5da…

MALICIOUS

PDF

66.6 KB Created: 2020-11-23 11:39:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ca2f73a3254b93603633b70f80bf77a3 SHA-1: 96ac9e5817c6ab81f2f876cc42eac5276de9adbc SHA-256: 817211d66420f5da52eb395c5fcbb302b5e6f3ac8d9f588e6121112b0aa0d2b1
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://trafficel.ru/123?utm_term=unblocked+games+76+hacked+happy+wheels PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393754/normal_5f90a01881083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379618/normal_5f9f129bc314b.pdfIn PDF document text
    • https://wijekuwonud.weebly.com/uploads/1/3/4/6/134645716/woteju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386837/normal_5f959225a50a1.pdfIn PDF document text
    • https://zafovuzixo.weebly.com/uploads/1/3/4/5/134588091/pawizilibov.pdfIn PDF document text
    • https://vujofuda.weebly.com/uploads/1/3/4/3/134375628/2448776.pdfIn PDF document text
    • https://rutedidatares.weebly.com/uploads/1/3/4/4/134490949/lijiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382413/normal_5fae9c44bb381.pdfIn PDF document text
    • https://welavofewefose.weebly.com/uploads/1/3/0/8/130813025/ruterusutojexiwudiso.pdfIn PDF document text
    • https://voxapinave.weebly.com/uploads/1/3/2/7/132740917/jomata_tixetis.pdfIn PDF document text
    • https://tidijutaxidekoz.weebly.com/uploads/1/3/4/5/134589823/wegovagisero.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376601/normal_5f8b74161f2e3.pdfIn PDF document text
    • https://jopalezaleloloj.weebly.com/uploads/1/3/1/3/131380469/218c5b8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC429 6012 bytes
SHA-256: 2290b9ff415b0b1e1a05be5d26a2003b03c5a3d7b4e6149e85634ec67932def0
font_01_sfnt_off0000d89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89D 12072 bytes
SHA-256: 9a828df5ef85552225efbd825649c68b0fe91c94f003edb9cd3fd8a93b20697b

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