Malicious PDF — malware analysis report

Static analysis result for SHA-256 36c024581881d2d7…

MALICIOUS

PDF

92.2 KB Created: 2021-02-18 05:41:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8e0dd6528cfc8cbf09915c17877d9de8 SHA-1: b6ffd9dacaf645dbdc4005a187b6e7cab871ed63 SHA-256: 36c024581881d2d742819e4841550b5cc6957ead10278f0226c4c4ba43a424fa
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with heuristics identifying it as a link farm designed to redirect users to potentially harmful sites, such as the one at 'yafferge.ru'. The presence of multiple disposable hosting links further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://yafferge.ru/123?utm_term=the+power+of+now+audiobook+full In PDF document text
    • https://bumobuzeki.weebly.com/uploads/1/3/4/4/134477779/80de87baa0c.pdfIn PDF document text
    • https://cdn.sqhk.co/pijovowifil/eCOEWYo/tengai_makyou_zero_sd2snes.pdfIn PDF document text
    • https://cdn.sqhk.co/pakiwujipubi/4ichigi/47829622200.pdfIn PDF document text
    • http://zuropofi.22web.org/kikisijefixaxenugikex.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/djeUaij/warlord_games_black_powder_review.pdfIn PDF document text
    • https://cdn.sqhk.co/didatife/8ujiG0I/13980692678.pdfIn PDF document text
    • http://mijuxub.66ghz.com/34849384220.pdfIn PDF document text
    • https://cdn.sqhk.co/gabixeme/6ibgcxu/nugopugudeluxekovevuvi.pdfIn PDF document text
    • https://cdn.sqhk.co/kagaxavog/caihohb/iv_coffee_lab_incline_village.pdfIn PDF document text
    • https://cdn.sqhk.co/sileluzorupo/dhbhdic/36007333400.pdfIn PDF document text
    • https://cdn.sqhk.co/ribegibonot/AJichhB/harry_potter_wands_mod_skyrim.pdfIn PDF document text
    • https://cdn.sqhk.co/girewobo/UjbVZOc/coin_collector_storage_cases.pdfIn PDF document text
    • https://kusafulidofet.weebly.com/uploads/1/3/4/0/134017607/gozabiviminu.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://rawatakutuju.rf.gd/wuraxifafa.pdfIn PDF document text
    • http://vutevesofu.rf.gd/secret_video_recorder_pro_apk_for_iphone.pdfIn PDF document text
    • http://najaxobefirag.epizy.com/visual_studio_2019_format_code_on_save.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D91 5000 bytes
SHA-256: 166c477c0d4f14c642184b720e5deb761d1ca7124b55c74793e9f4628e7f7914
font_01_sfnt_off00012e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E89 11452 bytes
SHA-256: 1668041432615fe97953a48fa240681caa89cad6e38a3601f8b9b0a6d8fc0e59
font_02_sfnt_off00015574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15574 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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