Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91eeb0d6109cb23…

MALICIOUS

PDF

75.3 KB Created: 2021-02-25 17:08:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2bb5d7d0220bf7a70f803bbbc39b963c SHA-1: 43d5317be5e6ede1ef0549eba3fceea09ebe4975 SHA-256: b91eeb0d6109cb238165cc1fc07ae04932f2c8f1febb7aaa14ca73ff1f642614
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically referencing a common technical issue ('My fios voice remote won't pair') to entice clicks. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links pointing to disposable hosting, suggesting a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/award?keyword=my+fios+voice+remote+won%2527t+pair PDF link annotation
    • http://custits.space/bangla_song_pagalworldy4wco.pdfIn PDF document text
    • https://jedunifoxawixe.weebly.com/uploads/1/3/4/4/134458330/8b4b754af9919c4.pdfIn PDF document text
    • https://toxosujaduwo.weebly.com/uploads/1/3/0/8/130874389/bae594f97.pdfIn PDF document text
    • https://cdn.sqhk.co/gixedomawa/gjjgkic/sonarqube_dashboard_multiple_projects.pdfIn PDF document text
    • https://kekageguva.weebly.com/uploads/1/3/0/7/130776826/sosos.pdfIn PDF document text
    • https://fuwowomazusora.weebly.com/uploads/1/3/4/0/134000162/7be7f6989dd99c9.pdfIn PDF document text
    • http://reassurez-moi-fr.info/gopukafadamaxrzhf8.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/how_much_does_a_sony_bravia_55_inch_weight.pdfIn PDF document text
    • https://zalevetupuxigex.weebly.com/uploads/1/3/0/7/130739655/bevixokafobim-judiv-boruva-pakivol.pdfIn PDF document text
    • http://poxumanavofeboz.scienceontheweb.net/what_are_the_hero_ranks_in_one_punch_man.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378393/normal_60353e267b6ec.pdfIn PDF document text
    • http://paxezot.getenjoyment.net/faxegitujora.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403282/normal_6036179e7e766.pdfIn PDF document text
    • https://cdn.sqhk.co/fexivijemozu/jekgEhj/44395528468.pdfIn PDF document text
    • http://help-copyrightviolationhelpcenter.com/91789769049h5pf3.pdfIn PDF document text
    • https://cdn.sqhk.co/zupololano/gchdXGX/73542494677.pdfIn PDF document text
    • https://cdn.sqhk.co/xutazazo/gkxq7Up/tivibinawopivaride.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/49747016334.pdfIn PDF document text
    • http://perexuwofogefo.onlinewebshop.net/gypsy_moth_nest_vs_tent_caterpillar_nest.pdfIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/reliable_change_index_calculator_excel.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_off0000e907.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE907 5420 bytes
SHA-256: 43cd6e0080b6f05bfb0128e5c54cd3f3d0de91285fe40741474ed19e563ff476
font_01_sfnt_off0000fb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB97 10688 bytes
SHA-256: fa4c3fac1e8ebb6212f76fced7177df4956b141891e66fb2886c5fee746ef2ff

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