Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b8b04407937627…

MALICIOUS

PDF

59.5 KB Created: 2020-11-07 09:18:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-19
MD5: a0002d239a0119d96e543cea07b73170 SHA-1: e642014c75ec0c3a83e3701c0c6afa5fd2df9e39 SHA-256: 37b8b04407937627deb5526b56b38b4beaee98fe896239c68d29d171db5f609d
194 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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://traffine.ru/123?keyword=pdf+of+american+assassin In PDF document text
    • https://cdn-cms.f-static.net/uploads/4382187/normal_5f8b922272da1.pdfIn PDF document text
    • https://namoxatiki.weebly.com/uploads/1/3/4/4/134477177/ab7a149817db.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/wilugugo/11841711788.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/723704ce-86b4-430b-b248-07b5dd2243a3/38219062263.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79526b42-0057-40df-b74a-a0cd60346b56/property_management_takeover_checklist.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/36983981340.pdfIn PDF document text
    • https://s3.amazonaws.com/gupuso/gearbox_parts_name.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/pdf_to_word_online_best_converter.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/davis_park_ferry_schedule_patchogue_ny.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/xenocide_free_ebook.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_off0000abe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABE2 5136 bytes
SHA-256: 44979af7da7bf4b5fa829831d768fd2904b489ac6277197cbfa5b9a2fe597d3d
font_01_sfnt_off0000bd44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD44 10684 bytes
SHA-256: 0f39731ff69266bd4ecae051f2bb72a09033c50667f2c33c7cadc8ff5cfa8607