Malicious PDF — malware analysis report

Static analysis result for SHA-256 400271bb955212d8…

MALICIOUS

PDF

74.8 KB Created: 2021-06-11 03:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b6b08300c574575daf4f0b44b12d4d79 SHA-1: 0a4d5689d5faa324aaba8a1c03b60813a0529406 SHA-256: 400271bb955212d865dece3b8ad8c7d3941b133f3754b6a382803e220586bd38
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The embedded URLs and the PDF's structure are consistent with a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://smidgel.ru/pbw?utm_term=the+worst+witch+and+the+wishing+star+pdf PDF link annotation
    • https://nifexikutufix.weebly.com/uploads/1/3/7/4/137499973/2cfcb375c67.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453907/normal_5ffe8a7404193.pdfIn PDF document text
    • https://dawitomow.weebly.com/uploads/1/3/4/4/134439013/kawiz-femodetapajawe-fivutu-jabapemagotixex.pdfIn PDF document text
    • https://tugajepefur.weebly.com/uploads/1/3/1/4/131453805/balifomav.pdfIn PDF document text
    • https://mojoranazo.weebly.com/uploads/1/3/4/4/134403481/1708919.pdfIn PDF document text
    • https://pagilosotutan.weebly.com/uploads/1/3/0/9/130970008/9570952.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/vusir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368732/normal_6047043730970.pdfIn PDF document text
    • https://zutumageru.weebly.com/uploads/1/3/0/7/130739253/1235113.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467926/normal_601b479abab39.pdfIn PDF document text
    • https://mekuzawejonoma.weebly.com/uploads/1/3/1/6/131606345/muvexasoxunabavo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466172/normal_5fd2707f75b09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489061/normal_604f68145bd19.pdfIn PDF document text
    • https://teveluzisobe.weebly.com/uploads/1/3/5/2/135299025/8618519.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/568c9e5c-349b-49bf-ab04-45d90c3b863b/latenege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e938037-3e09-4e22-8065-7ae22167422a/mathematics_9_quarter_1_module_1_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8a28e83-b12d-4db5-96f3-acb9658058f3/how_to_save_as_mp3_garageband.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38ce4519-3cba-4373-800a-7ef83aa2b072/how_to_reset_timer_on_westinghouse_oven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/497d87a1-e973-43be-92f2-b7dbb58401d1/sexual_orientation_essay_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b27b522-8cd7-47d9-9226-17c85e529c59/how_many_pages_are_in_the_son_of_neptune_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfec6a5a-95e2-4820-a44d-88196ace8dd0/how_to_sharpen_ego_mower_blade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/495d07a2-9c57-4bc6-aa7a-0d7e0bfc455e/21055333914.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_off0000e6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FE 5428 bytes
SHA-256: da311855dce75b3a47d99beb5f0e8c391ae2d509da66b19880ce4e8624fcfe3b
font_01_sfnt_off0000f983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF983 10760 bytes
SHA-256: 24956163a4a8ad80d622fd1e1d21bd59855f636e46fcc2efe5056fc113276c0f