Malicious PDF — malware analysis report

Static analysis result for SHA-256 8421633361f2ac0c…

MALICIOUS

PDF

76.0 KB Created: 2020-11-18 03:53:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: 11bf98785d9b0264f851d37a686575c5 SHA-1: 4be3d75e8d4968af30a878a52a2364334d811773 SHA-256: 8421633361f2ac0cf7bfe7cc502f343bd683f580c5c658eb7a47941c51319c84
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/123?utm_term=rogues+den+guide+osrs In PDF document text
    • https://cdn-cms.f-static.net/uploads/4372355/normal_5f9d5d0d5eba7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373992/normal_5f9d31b2f3bfb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414152/normal_5fa05b5624a60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422373/normal_5f9af3c940660.pdfIn PDF document text
    • https://minuzivajod.weebly.com/uploads/1/3/4/3/134354575/1570376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417422/normal_5f98d68bceee3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_5f8c1b79f0244.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_5f8994779f136.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374696/normal_5f89890e7ca2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375083/normal_5f8b8f81dfd83.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/kakef/71273038069.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/surf_lifeguard_training_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/709b9dbb-e2bf-4f6e-8d04-6b32e04d6d68/enzyme_lab_report_title.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_off0000eed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED3 4760 bytes
SHA-256: 3d2f0c52c17bd9f91f0f31d6f44b8ce5f6017b99c71dd5dd7c5dcaf4455575eb
font_01_sfnt_off0000ff17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF17 10612 bytes
SHA-256: 8df410041b6f196df8f6e3cf74e8371c0a83d15ea1d1e4105d7e126ef02668fe

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