Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcf9bbac95b0c812…

MALICIOUS

PDF

66.5 KB Created: 2020-11-12 17:50:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 75386ab6ecb7415d2f8101ac8a1f9b8b SHA-1: 0d968bf5f8dd4fee9ac5b55d9e7e8b9dd8b35d71 SHA-256: bcf9bbac95b0c8123402e21f99235e6d76dc741e9bcc7cc5056e08017a4f4acf
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/aws?utm_term=programmer+cv+template+uk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4410722/normal_5f9b5d78288a6.pdfIn PDF document text
    • https://botubadixebom.weebly.com/uploads/1/3/1/4/131407995/c6158782a23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392656/normal_5f9100b03e375.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385014/normal_5fad5892adb01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393515/normal_5faa49d8767b0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376362/normal_5fa9637c7bb3c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca9efade-f890-44a0-846b-b66e33477ca3/eleanor_rigby_orchestra_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/download_star_wars_the_force_awakens_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/81064956034.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/presbyterian_health_plan_medicare_advantage.pdfIn PDF document text
    • https://s3.amazonaws.com/ribowexulo/biochemistry_the_composition_of_living_matter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a8c4ecc-8c2b-451c-9011-bd004c715514/83523344612.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_off0000c677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC677 5200 bytes
SHA-256: a805e7c252d92ebf7ff5c7fa1bf8ffa51b4a40617621e9aae02e7ef1a84ea937
font_01_sfnt_off0000d820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD820 10988 bytes
SHA-256: 977c064ee17544c7ed54d8b37663cb212f77394ee9db5b0b20dc01d3719870b7

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