Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb1e21ecae7bba51…

MALICIOUS

PDF

70.3 KB Created: 2021-02-22 03:03:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: fa0ae534a911cd878478ef5cddb16b9d SHA-1: 9868024ccc23c895e50ce0f6c46cfcb4ff5c5941 SHA-256: bb1e21ecae7bba515f6080aaa0842dd78b1cd8c6d5b84d5aa64834b6d0231b6d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple heuristics indicating it is a link farm designed to redirect users to external sites, with one URL explicitly identified as a potential phishing or malware distribution point. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the PDF structure and embedded URLs point towards a phishing or malware delivery attempt, likely initiated via spearphishing.

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://baarspo.ru/strik?utm_term=how+to+use+a+power+probe+4 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490752/normal_5fc85963e36a8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476936/normal_60174880cd37c.pdfIn PDF document text
    • https://cdn.sqhk.co/bepotedaxus/bbjbic2/46608981292.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388820/normal_5fc87dba7eb6f.pdfIn PDF document text
    • http://ig-socialmedia.xyz/rudoxaxivitrll35.pdfIn PDF document text
    • https://cdn.sqhk.co/runolisor/igjhBbI/47837525143.pdfIn PDF document text
    • http://wekeb.space/contabilidad_financierayfopg.pdfIn PDF document text
    • http://getporte.xyz/cisco_switch_vlan_configuration_commands6uxrv.pdfIn PDF document text
    • http://leqqurint.online/grand_auto_theft_game_freeg8bo8.pdfIn PDF document text
    • http://romeital.space/apology_email_for_providing_incorrect_informationo4ucw.pdfIn PDF document text
    • http://narewenu.22web.org/90130514715.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403936/normal_60119da99eac4.pdfIn PDF document text
    • https://cdn.sqhk.co/molivovuki/hhhYPgj/negomesikuwiledutirowu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jaxeseludozoke.rf.gd/boiler_efficiency_test_report.pdfIn PDF document text
    • http://xivegujox.epizy.com/chale_aana_mp4_pagalworld.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/luzekuvikebuxelol.pdfIn PDF document text
    • https://s3.amazonaws.com/netinuwa/4022044861.pdfIn PDF document text
    • http://xefezude.epizy.com/74849670105.pdfIn PDF document text
    • http://marabawem.rf.gd/biripat.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/dragon_ball_gt_virtual_piano_sheet.pdfIn PDF document text
    • http://lugetobuzisufa.rf.gd/de_jogos_para_nintendo_switch.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/jalutupik.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_off0000d37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD37E 5060 bytes
SHA-256: bec3f629a0ef3ba3ab92b1ba0f353d6af2c08180de3ee936bfa7f386a7654bf6
font_01_sfnt_off0000e4d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D5 11576 bytes
SHA-256: a99a77bfb31a0eda4632ebb12b902fd94d8a2f9c24cbaf6cbec5a167cbb9f020

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