Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4649bdca07db6cc…

MALICIOUS

PDF

72.1 KB Created: 2020-12-04 04:26:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 872cdd8ecfa71cc8dd52d69a102121e8 SHA-1: 0ef24d58473d6b88315ab50329c3f14bf3d9f2ec SHA-256: f4649bdca07db6cc3959037521f18812ff2e5fa3ec60e253d835ee3b48ffc15f
134 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV. It contains multiple external URIs, including one pointing to 'trafficel.ru', suggesting it is part of a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure, possibly related to a 'Digestive system review worksheet', intended 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 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=digestive+system+review+worksheet PDF link annotation
    • https://xedaliwim.weebly.com/uploads/1/3/1/4/131454603/wumuxizezadi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367308/normal_5f87ce6c009a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376600/normal_5f9264847dc6e.pdfIn PDF document text
    • https://juporolo.weebly.com/uploads/1/3/1/3/131380745/1696541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366407/normal_5f97632bea2de.pdfIn PDF document text
    • https://sibinepenisux.weebly.com/uploads/1/3/4/4/134467302/8266492.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393035/normal_5f93cc1c7a354.pdfIn PDF document text
    • https://jonapofa.weebly.com/uploads/1/3/4/6/134699055/vurag_wugopoximapuru_wugovusez.pdfIn PDF document text
    • https://vimiwegom.weebly.com/uploads/1/3/0/7/130775837/5114437.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/dutimajizowa/cuddeback_capture_1125_firmware_update.pdfIn PDF document text
    • https://s3.amazonaws.com/gazivemon/21005056580.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc531585bcb0228a29e8486/t/5fc60474f8cdb769c6b22801/1606812789504/graphing_the_business_cycle_worksheet_answers.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf92664be903ae63ffe4d/1606220074021/nra_foundation_mission_statement.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_off0000e004.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE004 5172 bytes
SHA-256: b2ccc1e9e2d722241b71e47ce76e76dc5922d4ec402c84789c3580c5ddc4d287
font_01_sfnt_off0000f199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF199 9868 bytes
SHA-256: d0d8add27eb0adefc57dcf027210427c00254746ae163fb7552d668827d60167

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