Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3ca7604511152c…

MALICIOUS

PDF

67.6 KB Created: 2020-11-25 22:08:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 42a4547f971e3cbbb9e1bb50d8e4844b SHA-1: 76e3e2b501eb241ad2e386e5e1b6d665b8a296f8 SHA-256: cf3ca7604511152c683eb2e30118489d8bdd92da7be29d68ef95ad3a6946c28c
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://gettraff.ru/wb?keyword=is%20seeklogo%20safe%20to In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384483/normal_5f9ca0fbb4e5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408875/normal_5fb9b687a7a1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409602/normal_5f9d57fe58a62.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423442/normal_5fb2740e20450.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405644/normal_5fb51318a54ca.pdfIn PDF document text
    • https://jakedekokobara.weebly.com/uploads/1/3/1/3/131381480/1469848.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381529/normal_5f8b6b99a1f82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382187/normal_5f8b922272da1.pdfIn PDF document text
    • https://xikematevi.weebly.com/uploads/1/3/4/3/134392378/kavugajitatir_zalokekujaz_povul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404299/normal_5fad928873601.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475866/normal_5fae166975fbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367278/normal_5f8c3c618daf2.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/xufaxoferugod/voxevazarirokedivus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0abc07fb-b489-4d18-9638-d0c1ccd7b156/dajajuzatawiko.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/faradaruporewobamakaji.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_off0000cc89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC89 4840 bytes
SHA-256: 0039c46aca24f69e06ecefda80fc353892c7bc85cc84bdff915f9bb636efd52a
font_01_sfnt_off0000dd20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD20 10740 bytes
SHA-256: 2be5de99381efdde4f490dbd15387f30bf21f81205cde4a645c688a474274331

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