Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ee06d13be237a88…

MALICIOUS

PDF

79.0 KB Created: 2021-04-07 13:53:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6b09a06a2d5de71d053712ef1b5fe599 SHA-1: baac63ff87bf2371a43c23488db0c380372d9bff SHA-256: 9ee06d13be237a88ff9799ad158a4c9ba16e0113e1714805982befc410b47def
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. Heuristics indicate the use of an image lure to redirect users to the URL `https://jacksth.ru/award?keyword=physical+science+concepts+in+action+chapter+5+pdf`, which is likely a phishing or malware distribution site. The document's structure and embedded content suggest it is designed to trick users into clicking the link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jacksth.ru/award?keyword=physical+science+concepts+in+action+chapter+5+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4415950/normal_60248927ac10a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468831/normal_5fe2b191a6c1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466140/normal_606b104a6909a.pdfIn PDF document text
    • https://cdn.sqhk.co/rogapakaler/cBjbMge/notodewovudu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480393/normal_5fd918a6b7054.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402014/normal_6035c7e18e818.pdfIn PDF document text
    • https://cdn.sqhk.co/velizovatim/giaibje/arborist_tree_report_cost.pdfIn PDF document text
    • https://cdn.sqhk.co/pavoraxebute/icKjWgd/miduxanawubuvujoneberuri.pdfIn PDF document text
    • https://cdn.sqhk.co/fajaleniwa/R8ibgho/majokuzotorej.pdfIn PDF document text
    • https://cdn.sqhk.co/perekowemo/giDEhj0/22888467102.pdfIn PDF document text
    • https://cdn.sqhk.co/jawuraxexije/hdjhheO/fruit_pop_bubble_shooter_game_online.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/xujitezu/rujut.pdfIn PDF document text
    • https://s3.amazonaws.com/gomakobez/communication_and_interpersonal_skills_interview_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wujixus/district_131_report_card.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/unterschied_ti_83_plus_und_ti_84_plus.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/62559418610.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_off0000f624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF624 5468 bytes
SHA-256: f433e2f0bd1741128d3f22da99a9ed0e9a65cb26bb2ee4fce8113a5cd0f82f9f
font_01_sfnt_off000108c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C8 11000 bytes
SHA-256: 72f5d8bb750855c030be24ed2fa0e981ee9f71d5cbe46ec85e39a97e23fe64d7

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