Malicious PDF — malware analysis report

Static analysis result for SHA-256 440581bc2df02f74…

MALICIOUS

PDF

68.4 KB Created: 2020-12-26 04:37:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4e49ec7effbbc7b95c6b33a8971f6a90 SHA-1: 81b956b541425c72bbf6e5fdb8a30abc10067d83 SHA-256: 440581bc2df02f747784faaaf4bf98b1e485a8f34f29c59a169a0a2203673ad6
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file exhibits characteristics of a link farm, containing numerous embedded URLs pointing to various external sites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' indicates that at least one of these URLs leads to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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.
  • 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.
  • 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://traffmen.ru/wb?keyword=hard%20boiled%20eggs%20in%20air%20fryer%20australia In PDF document text
    • https://lomimasexoguxi.weebly.com/uploads/1/3/4/7/134736135/affdb40b3fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372085/normal_5fa37b312147b.pdfIn PDF document text
    • https://togutugu.weebly.com/uploads/1/3/4/6/134617883/samododuw_lalebomujuf_rebeb_vevolibevukev.pdfIn PDF document text
    • https://rutebamem.weebly.com/uploads/1/3/4/8/134862863/feaccf26db.pdfIn PDF document text
    • https://kejobogufepemis.weebly.com/uploads/1/3/0/7/130775396/pexul.pdfIn PDF document text
    • https://nawogixabejuj.weebly.com/uploads/1/3/4/6/134617161/3f1c86ef90fa6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444626/normal_5fe62de379079.pdfIn PDF document text
    • https://muxosafexokole.weebly.com/uploads/1/3/4/4/134485240/b23e54089c7a40.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/jiwisigetizoxif/94293706418.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec05ba51-a95c-44a3-a683-9c49e5d5ba83/shake_shack_menu_vegan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d636b8f-e6e8-4cae-9bc0-55c3207e4366/33519674638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3090c3cb-1fdc-4b44-b380-5fcda78b0cee/74757989327.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b47726f-538a-43f6-b4d1-563d106cbe12/2d_dynamic_array_c_delete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4bd6893-d3e0-498c-88fb-160fae999d98/89478378887.pdfIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/vobegotebetusuxalaza.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD215 5276 bytes
SHA-256: ed6770c414f7133726f38b7b2520d2f5043e25558773902b01a9b0533cf68628
font_01_sfnt_off0000e418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE418 10344 bytes
SHA-256: 0a2705e23375ab71fab9cb8da04736de04460523c8a200c9cbac4c6a8f869593

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