Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fced865f2368d49…

MALICIOUS

PDF

76.0 KB Created: 2021-02-19 02:48:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 262b6ce07984fcd8fc7ade491e34b05f SHA-1: f4988e391dd7da09b7041374bc5cee9388cde474 SHA-256: 3fced865f2368d498d004c21029f9447f8b312b855678538237ad0f6dab4bb78
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of embedded URLs and the overall structure point towards an attempt to distribute malware or phish for credentials through SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/strik?utm_term=how+to+use+switch+timer PDF link annotation
    • https://xinofebew.weebly.com/uploads/1/3/5/3/135305957/3321580.pdfIn PDF document text
    • https://cdn.sqhk.co/marixefe/gjhJiif/mexican_football_federation_twitter.pdfIn PDF document text
    • https://pejoguroboxifuj.weebly.com/uploads/1/3/1/6/131637830/6557039.pdfIn PDF document text
    • https://rimixobavi.weebly.com/uploads/1/3/3/9/133987070/2800834.pdfIn PDF document text
    • https://cdn.sqhk.co/kizofapekeku/jdueuje/34124543674.pdfIn PDF document text
    • https://cdn.sqhk.co/boxepupovemu/f1qzMhb/blocky_superbikes_race_game_motorcycle_challenges.pdfIn PDF document text
    • https://cdn.sqhk.co/loganidob/m8hdhbT/3d_zombie_survival_games_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499995/normal_602efde8e6317.pdfIn PDF document text
    • https://misamizejip.weebly.com/uploads/1/3/4/3/134348089/265873.pdfIn PDF document text
    • https://sudororurupe.weebly.com/uploads/1/3/4/6/134602833/sudeborinadumezinuze.pdfIn PDF document text
    • https://pegogelixuj.weebly.com/uploads/1/3/0/8/130813965/e87c47308.pdfIn PDF document text
    • https://cdn.sqhk.co/kanemili/hgjib6X/32597720765.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexofap/aihF5Td/6325322822.pdfIn PDF document text
    • https://kilosite.weebly.com/uploads/1/3/0/7/130739696/basikejazerotoku.pdfIn PDF document text
    • https://cdn.sqhk.co/vumuwilaj/bhbhbi4/64149438472.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402949/normal_6028426d36b08.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412909/normal_5ff2c746ed96a.pdfIn PDF document text
    • https://cdn.sqhk.co/miraroki/ggtgcmP/idle_town_definition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE030 4628 bytes
SHA-256: 1c5f61021ad09afeb7a9e5498b55edbc4f8dae281802ecb4d8ff2bf8a55f201a
font_01_sfnt_off0000effc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFC 10724 bytes
SHA-256: ea815b11a0bc3f175785e7053ce33a307653ee21097df37b72cf8d946a655fdc
font_02_sfnt_off00011484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11484 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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