Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb4131cd3a6aa8c0…

MALICIOUS

PDF

80.6 KB Created: 2021-03-22 08:33:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 7530e065f821e120feaaf87f394c6d98 SHA-1: 035a00684baa51349c196a10085d110f2d03785f SHA-256: bb4131cd3a6aa8c00855d32f5b2c313f2e269a6f1529eb54621a867c6eb543b3
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with several pointing to disposable domains and potentially malicious landing pages. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests it's part of a link farm designed to host many links on disposable infrastructure, a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=biology+book+high+school PDF link annotation
    • http://vvd.bar/merowozisepuztwy2d.pdfIn PDF document text
    • http://bufo.online/commendation_letterrg7j3.pdfIn PDF document text
    • http://blog-millionaire.buzz/abdominal_trauma_management34in8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366000/normal_604204158a2ac.pdfIn PDF document text
    • https://cdn.sqhk.co/xalesikozip/hdhh1ic/nonedoselolew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455669/normal_5ffb809d71061.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446649/normal_5fe207dccb4d3.pdfIn PDF document text
    • http://scoretdho.best/54426596089s9tug.pdfIn PDF document text
    • http://organicsss.space/beat_the_boss_game_freei6vwf.pdfIn PDF document text
    • http://replyua.site/free_keto_diet_plan_for_beginnersup0rr.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/Vihycmu/you_are_god_alone_william_mcdowell_bpm.pdfIn PDF document text
    • http://foyou.store/dipevojubigoridemoti507cf.pdfIn PDF document text
    • https://cdn.sqhk.co/dugelabomaw/hizgf2x/ginetobusuvolozif.pdfIn PDF document text
    • http://magic-world.site/73623318548vka7r.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373509/normal_60215f2f2a233.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383921/normal_6003a5ea147ce.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/tetenifeme/19090654598.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/action_bar_size_android_studio.pdfIn PDF document text
    • https://4c72699b-aa2e-4dc8-8bd5-1a54e8f938a6.filesusr.com/ugd/f3cb45_2559f0eae1044dffafdbf984a29d2ad9.pdf?index=trueIn PDF document text
    • https://2cc935b2-b854-4d3d-8499-e3bac5ec7384.filesusr.com/ugd/2e82fc_6d02cc7ac36648259980f9a501197925.pdf?index=trueIn PDF document text
    • https://6593eeda-10fe-4128-810f-cbbc79f0a4f8.filesusr.com/ugd/c0a4bf_06220930289f49199f40d27b4dcfaec0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pokorevalaxex/valesugelo.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_off0000fc25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC25 5112 bytes
SHA-256: 2847ea37998cda9ef8a7970de56ad54f15a385adc31634db171ffa9a885551fd
font_01_sfnt_off00010d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D9E 11492 bytes
SHA-256: 152915bd05ceae643bd0d06f2a227b83b39ef196efe2eb1fc882904d95ed97df

Open this report in the interactive analyzer, or submit your own file for analysis.