Malicious PDF — malware analysis report

Static analysis result for SHA-256 64cbce485578afa4…

MALICIOUS

PDF

67.7 KB Created: 2020-12-24 07:17:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 26fca4d883c210db4b5e2f3ce181251e SHA-1: 4e98c5fa11a0de6738d6956fdfda87cd841ec4bd SHA-256: 64cbce485578afa4c1f80931cb7566451694be962268c73bef39efc79f973e1c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous external URLs, many of which point to disposable hosting services. The document body, though heavily obfuscated, contains a reference to 'Bunny empires war and allies' and the authoring application 'wkhtmltopdf', suggesting a lure to a malicious website. The presence of multiple external links and the 'PDF_SEO_LINK_FARM' heuristic strongly suggest the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://traffine.ru/strik?utm_term=bunny+empires+war+and+allies PDF link annotation
    • https://xulavuxedipi.weebly.com/uploads/1/3/4/0/134017657/sopetase-marivoxe-gikilir.pdfIn PDF document text
    • https://cdn.sqhk.co/gifitebona/jahcuic/lukas_nelson_shooter_jennings_songs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451542/normal_5fb2a7a07bf05.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496571/normal_5fc14668d4b4c.pdfIn PDF document text
    • https://tufiganifipira.weebly.com/uploads/1/3/4/3/134310976/752037.pdfIn PDF document text
    • https://nakefofomiruni.weebly.com/uploads/1/3/4/4/134483242/lobevekibe.pdfIn PDF document text
    • https://cdn.sqhk.co/netesatova/R5CLpGA/best_air_war_games_pc.pdfIn PDF document text
    • https://morutasatosode.weebly.com/uploads/1/3/4/3/134366393/fimerejuzus.pdfIn PDF document text
    • https://tijabitosivu.weebly.com/uploads/1/3/4/3/134396728/fogimedab.pdfIn PDF document text
    • https://cdn.sqhk.co/mepetiruzi/gcahc1A/best_movie_editing_software_windows_10.pdfIn PDF document text
    • https://gumewixolasadaz.weebly.com/uploads/1/3/4/6/134659592/litolubaw.pdfIn PDF document text
    • https://cdn.sqhk.co/dupeguwova/hc9ciea/802_east_front_street_plainfield_nj.pdfIn PDF document text
    • https://xawavefite.weebly.com/uploads/1/3/4/6/134667803/figolatu.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/bulolimepol/boulder_dash_30th_anniversary_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/dofufiri/22159120276.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB632 5348 bytes
SHA-256: 13f57d3c6226fb0ce27806b65924c48879b702ebbefbdd1637e4bcb18efd7316
font_01_sfnt_off0000c85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85E 10840 bytes
SHA-256: 38e92f8b38912dd26ae2d5dc94c144564afeaa45fe41459c0aae0b47060958db
font_02_sfnt_off0000ecc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC5 16144 bytes
SHA-256: 18f56b7fae04e07bc119a468ad323bdda099da77b0772854d1c47cc1f39b9f3b

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