Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6499bb1317b056e…

MALICIOUS

PDF

78.7 KB Created: 2021-03-21 00:11:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b8e3edcf6f93536bd81bbf50880f0d84 SHA-1: 284d8ac80dc31051e08f36490a2f01b9532429f3 SHA-256: a6499bb1317b056e66721215e21a8c265f547d3dff0aed749257b733a19b227f
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 phishing or malware distribution attempt. The document contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly suggest an attempt to trick users into visiting potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=weber+smokey+mountain+14+capacity PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500187/normal_6051114e5249f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388613/normal_6036bc1f6294f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470826/normal_60179df0dd9f0.pdfIn PDF document text
    • http://murupewobot.iblogger.org/34216453165.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465394/normal_5ff4c84fd08cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425784/normal_604f9797adaf3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386834/normal_6009203ab5923.pdfIn PDF document text
    • http://creditscoretracking.info/how_to_get_jlab_earbuds_to_connect_to_each_other26k6p.pdfIn PDF document text
    • http://ctuxuu.com/dinosaur_chase_zoom_virtual_backgroundin63z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372087/normal_6027b6258134e.pdfIn PDF document text
    • http://busforpay.online/canon_in_d_major_johann_pachelbel_piano_sheet_musicx3jqb.pdfIn PDF document text
    • http://arthromedshop.xyz/147110110278i8fn.pdfIn PDF document text
    • http://hookup668.site/world_war_2_battlefield_finds6x9zw.pdfIn PDF document text
    • http://revunazem.22web.org/vovosasajivegunupegawik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://satuwegalenez.epizy.com/saga_volume_1_review.pdfIn PDF document text
    • http://susodiwur.epizy.com/direct_and_reported_speech_meaning_and_examples.pdfIn PDF document text
    • http://potiwivig.epizy.com/dejoli.pdfIn PDF document text
    • http://wirijabi.rf.gd/40109307236.pdfIn PDF document text
    • http://kovusilo.epizy.com/xefinunumisix.pdfIn PDF document text
    • http://satekivu.rf.gd/98070061296.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_off0000f349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF349 5504 bytes
SHA-256: 730ccd1f363adb8b1f8fe074dd37947419f9fc2aa7b4468d17aa041361735023
font_01_sfnt_off0001060f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060F 11164 bytes
SHA-256: 2b97dd54ec3a22d8acffbb54b4a2688a89e0a0a9a24617510dfda391a01cf5f0

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