Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a9a5c12ebad4c5…

MALICIOUS

PDF

68.1 KB Created: 2021-03-25 04:27:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b8e48600c6ad32b9018cd7be463f6ef4 SHA-1: a4e9b48466b33eef118879349cd399550a7a261f SHA-256: d8a9a5c12ebad4c560c22fa7047cad7a51aeb5f1dc981f52b3c7cc1dfc4e1993
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, with the primary suspicious URL being 'https://gimoguvi.ru/strik?utm_term=sunbeam+bread+maker+parts+nz'. The ML classifier and ClamAV detection strongly indicate maliciousness, classifying it as a phishing trojan. While no scripts were explicitly extracted, the structure suggests it's designed to redirect users to a network of potentially malicious sites.

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 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.
  • 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://gimoguvi.ru/strik?utm_term=sunbeam+bread+maker+parts+nz PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4478927/normal_603a99b121741.pdfIn PDF document text
    • http://unityfree.xyz/how_to_turn_on_hp_desktop_monitorkoyz5.pdfIn PDF document text
    • http://avtoshtorki.shop/73954614525y8yki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418379/normal_60372eaad389f.pdfIn PDF document text
    • http://idealicaitaly-ufficiale.site/sumonawitanifigiwedozlp9n9.pdfIn PDF document text
    • https://xizenarinirogav.weebly.com/uploads/1/3/1/4/131437147/d12b64f6817.pdfIn PDF document text
    • https://lewibodozibepa.weebly.com/uploads/1/3/3/9/133997785/bovilepikijek.pdfIn PDF document text
    • http://keto-menu.online/world_war_two_history_quizkwwq5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_e4c89b88e56e44f6aece76f5ee5caa37.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejifavo/novasegufinefosaluguxivef.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/places_that_i_can_donate_furniture.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/app_store_guidelines_gambling.pdfIn PDF document text
    • https://f8ba888e-8f71-4fde-8303-550399648f4e.filesusr.com/ugd/17ce20_1e4731cf587240e081ee853a1a89bfc3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/what_year_did_the_samsung_galaxy_note_4_come_out.pdfIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_732f3c3b48104dacbca97460fc4ee2a5.pdf?index=trueIn PDF document text
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_2e5699c0765c49609c76534b5df85103.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dotivaf/wordscapes_answers_1041.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/tuxexepifegexu.pdfIn PDF document text
    • https://171e2b11-24ea-4535-acac-f971ec821c4b.filesusr.com/ugd/a07927_f2ca021aec0f49028d523a3124cbbb95.pdf?index=trueIn 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_off0000cd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD63 5428 bytes
SHA-256: 92e1487f78ae78b81ee46a7863832d8e82c5c4aaef793eb36daa1484c45ca415
font_01_sfnt_off0000dfc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC0 10460 bytes
SHA-256: ea152b6339fd3ab209639af4340d120eeb24b009e6f75f33b18f477d41585af5

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