Malicious PDF — malware analysis report

Static analysis result for SHA-256 62486dbdc43d9be9…

MALICIOUS

PDF

83.9 KB Created: 2021-06-11 05:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 03fb33c8050a41609b7597287aa02d05 SHA-1: 05b0ab2fcc0080fcea58a8150677c1ab8c8a3d24 SHA-256: 62486dbdc43d9be95cb6cb4c80eacd7cd4af5651f7a254531f93f93516af2230
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one prominent URL pointing to 'queure.ru', suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this PDF is part of a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://queure.ru/pbw?utm_term=mechanics+of+materials+timoshenko+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4392668/normal_600bb691c577b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420039/normal_6024aa0f14fff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378378/normal_5ff166c0aa0ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424683/normal_602f8d179df0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484356/normal_60683bc488d0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491432/normal_6017523e20f49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405929/normal_605d73f22d192.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/fc60f58a-7158-4213-a710-57f1808b0940/cuales_son_los_3_principios_de_economia_de_movimientos.pdfIn PDF document text
    • http://togusan.pbworks.com/f/rabuvatenapatusibojumovex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f128b3e-d81e-46b2-8865-d0716bc7cff4/good_fantasy_adventure_books_for_young_adults.pdfIn PDF document text
    • http://fuxotatizexu.pbworks.com/w/file/fetch/144628734/3d_paper_model_templates_jet_airplane.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c84cf0b6-1fa8-47ee-96cc-c54b6e56cd5e/is_the_maze_runner_a_childrens_book.pdfIn PDF document text
    • http://lerepaxa.pbworks.com/f/wukoxovofigikinepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a284a0b-24ae-4775-816f-87977713c0e2/what_are_some_examples_of_fairy_tales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7762ec5a-c0c9-41f7-827f-86fbb05f3d45/90605883895.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/259ef36a-d893-4521-8834-d30fce3d1ac9/varuxokemowodimutipipej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf461674-2507-4b22-b38f-d6d160628a18/57278441126.pdfIn PDF document text
    • http://vibuvedatixi.pbworks.com/w/file/fetch/144718812/razotuwuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7258792a-c75b-4112-b312-0102063abc61/tasadamexoxaviwumosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a59032ea-58b2-4b7f-9a1a-2b162defb7cd/57345477230.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/114f26ed-74b1-4537-a02a-fca53fc7e2e9/59400534777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77cf1d75-b7a3-45d3-85bb-bc2cfeac7edb/63573991405.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84b25b54-842b-4fa7-a28d-15d5b95949b0/80744398169.pdfIn PDF document text
    • http://xulajirose.pbworks.com/w/file/fetch/144623070/my_farberware_coffee_maker_isnt_working.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_off0000ffb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB4 5464 bytes
SHA-256: fd0e2d6a861fc4bc997791d9b5f6e790e4819e7f75b6af12a508611787e4007d
font_01_sfnt_off0001122c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122C 15376 bytes
SHA-256: 00aae7bb00780d84b51f9b9c3a9d033142ac7684e5ad661b1b7a8f98063d41ea