Malicious PDF — malware analysis report

Static analysis result for SHA-256 c74fc5c3d55a2115…

MALICIOUS

PDF

61.8 KB Created: 2020-11-26 22:43:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 020e4f2a75a1522e268e7b87f30990ea SHA-1: d5ebb2841782360855e285ffd440d5d1217d430c SHA-256: c74fc5c3d55a2115b200eac0a0d82eeb552eadcfe39756dc70e1c8dc96799bc5
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/wb?keyword=labyrinth%20grinning%20man%20sheet%20music In PDF document text
    • https://cdn-cms.f-static.net/uploads/4444866/normal_5fa60d925710c.pdfIn PDF document text
    • https://xijoxamapapi.weebly.com/uploads/1/3/4/3/134337958/vixep-nivadatuwepima-nirenatofi-lufibakufiwixi.pdfIn PDF document text
    • https://dotigima.weebly.com/uploads/1/3/4/4/134404546/sotax-rojanobomexizo-xagaveremotig-texavuj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463306/normal_5faf16133e5b3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5fb8f210915cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367950/normal_5f90d514715bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373281/normal_5f893dccb77b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370528/normal_5fa02c10a38df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416796/normal_5fb0268fc2e92.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/loxovijevifam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373511/normal_5f9c32318e38d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404741/normal_5f9f2ce7d9587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502567/normal_5fbad224bfa69.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/fokapikow/net_interview_question_and_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/jadere/biochemistry_proteins.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_off0000b28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB28D 5364 bytes
SHA-256: 669a3df6aa2da33df42aa78f9081c7db7a73668a41cb460ec2ebf93636df04b2
font_01_sfnt_off0000c4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4B1 11080 bytes
SHA-256: e9767afc7778dd5238150455e4b75bb84c1e3cfb374616777673b239ccb4c6b4

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