Malicious PDF — malware analysis report

Static analysis result for SHA-256 413bbd81b7711756…

MALICIOUS

PDF

78.2 KB Created: 2021-04-05 01:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fc3a4b7f56eb3fccaed9bc99ecd10fb4 SHA-1: 5b3f15f625b250426e80d6aff33a9717d49bbec3 SHA-256: 413bbd81b7711756557b2f30ef802809fdb11a0853b7cf1ffe9f154f5372991a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://xajibur.ru/strik?utm_term=maytag+bravos+xl+washer+complaints PDF link annotation
    • https://jisawawaxiwibes.weebly.com/uploads/1/3/1/6/131606947/zarexixurojipafab.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/zniajdl/stylist_girl_make_me_gorgeous_free_online.pdfIn PDF document text
    • https://cdn.sqhk.co/nufomewo/uhfhhha/bilobebabudibo.pdfIn PDF document text
    • https://cdn.sqhk.co/zotiperugi/iggfjjJ/whispering_pines_nc_campground.pdfIn PDF document text
    • https://poxemitiwafu.weebly.com/uploads/1/3/1/8/131871555/3959419.pdfIn PDF document text
    • https://jafakatulo.weebly.com/uploads/1/3/4/3/134353771/819779.pdfIn PDF document text
    • https://cdn.sqhk.co/sepokafaru/xyogdEh/5270560345.pdfIn PDF document text
    • https://vulabomanuxuw.weebly.com/uploads/1/3/4/8/134857085/b1eca6607b52.pdfIn PDF document text
    • https://lusenivusimutom.weebly.com/uploads/1/3/4/8/134887898/8215780.pdfIn PDF document text
    • https://cdn.sqhk.co/nemuvefik/aei1eif/dermaset_3d_rollerball_eye_serum_nz.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/ab9b788d-a42e-4cfa-ad2e-51b071fdc0a6/engageny_geometry_module_2_lesson_24.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fd6234a-37e2-4d1f-8fe9-2c580627d1ed/where_did_the_industrial_revolution_first_occur.pdfIn PDF document text
    • https://aaf8962b-2ea5-4403-bfea-7c32f2b3f77e.filesusr.com/ugd/8f3a65_76c26d51545c49a4bad6f6933db2b8c0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb3da60c-d3f3-4649-9b69-d7a4f0ba0821/why_is_my_thermostat_saying_wait.pdfIn PDF document text
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_a45b3e435f65440398ea00ef41610ef0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd9c6b7e-7249-4d03-aa82-6c4f8515bc4f/95593863488.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c45540e-8411-4037-a959-ce348b56b445/99039459198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7813fa58-f462-4370-877b-86174e284c8a/85048199608.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bf6d7c9-bcb7-4ba0-b4b9-e462eacc959a/how_to_analyse_data_collected.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1cf9b11-9432-4f71-8853-c1711603aa01/11569139578.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE52 5816 bytes
SHA-256: 9274175557f3bb291b73520fb6481565c4a4f2423f9fcd8ff2ca6aa158f66e56
font_01_sfnt_off00010221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10221 11596 bytes
SHA-256: 9bb84bf5215bfa6a40e6fdcd6fb575c2ae02caf430a210f75de0b27150a809a8

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