Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce37c9da40f7f4df…

MALICIOUS

PDF

70.9 KB Created: 2020-12-21 17:23:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 67b4a24a79f90e668ea8d6e66b7c9ff3 SHA-1: 718a1fe9d229cdaea1037eb4647acb507e7906f4 SHA-256: ce37c9da40f7f4df909a1bdc3034460d9d2b51557be939326e1e47706f6fb198
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, and heuristics indicate it contains an external URI and an SEO redirector link. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. The primary IOC is the redirector URL, which is likely used to deliver a secondary payload or phish for credentials.

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
  • 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://trafffe.ru/strik?utm_term=top+country+songs+of+the+80s+list PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4479462/normal_5fdee09d5c7e7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403271/normal_5fc4bde82761b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465259/normal_5fa3c03b6e5c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425915/normal_5fa2f076e5186.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449774/normal_5fc72d90c45ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409840/normal_5fd2d2e42425d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/d6e15607-66d3-4392-bc32-eab6d758a781/13563869266.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef8fff24-8ced-418e-8926-6d8f5646d467/list_of_sins_in_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3bc47445-eacd-4895-a569-03106df025c3/may_the_father_of_understanding_guide_us_all.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/547fcaee-4278-4857-ba11-4e9e1bae5840/55549523766.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/dajijetefiji.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

Related samples 4

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC00 5336 bytes
SHA-256: 9f66387f42f9a583d7abb0ad40391a8b07ac2841fe08bc394c68e5d545fa8458
font_01_sfnt_off0000de26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE26 10196 bytes
SHA-256: aff1fce04de7f398b7798105352e62d02d507f84714922e7b1b30bc2e4124e1a
font_02_sfnt_off000100ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CE 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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