Malicious PDF — malware analysis report

Static analysis result for SHA-256 b519600ffda6a01a…

MALICIOUS

PDF

98.9 KB Created: 2021-02-17 17:17:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 07fc4b8248d1b2b7bb77a5bd0032a483 SHA-1: 291ea7bc24912f3e13ef7ca8f8fc05f759e2858a SHA-256: b519600ffda6a01a60f19629216e47e72adea908be3a30bf7e78c0604b66045c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to a transcript, likely to trick users into clicking the embedded links.

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://seumenha.ru/strik?utm_term=jimmy+neutron+i+dream+of+jimmy+transcript PDF link annotation
    • https://cdn.sqhk.co/taxotuzu/hhh9hdj/jubegajuriwik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478669/normal_601a84bf5d204.pdfIn PDF document text
    • https://zobegutibeg.weebly.com/uploads/1/3/4/9/134902349/rawigukug-zobosuwesero-watixewesesenu.pdfIn PDF document text
    • https://wevepuxobufo.weebly.com/uploads/1/3/0/7/130776344/f48924693.pdfIn PDF document text
    • http://spain50off.info/math_vision_project_module_4_answer_keylqskr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408601/normal_6008247866eee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475392/normal_60206f8724472.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384820/normal_6025884087f67.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387581/normal_60292bc0f3126.pdfIn PDF document text
    • https://cdn.sqhk.co/susorajin/p0ghMcq/54510166615.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387566/normal_5ff2867c56b0a.pdfIn PDF document text
    • https://noragunefide.weebly.com/uploads/1/3/1/6/131637841/22bedf51567f9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487386/normal_5fefbb883cbf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466408/normal_5ffb5a27d4f56.pdfIn PDF document text
    • https://xibowawagapuj.weebly.com/uploads/1/3/1/3/131383975/12eed72e467e.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_off000148f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F3 5436 bytes
SHA-256: 02eb51bda2438303334117a67ff0ec35e2fc4f10b4ea8ff86caf001747aa5191
font_01_sfnt_off00015b73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B73 10056 bytes
SHA-256: fabfe6448ed0e61b9b5bfd867bfa9fa1fbccfb4a30af6694ffe1703a3a92273e

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