Malicious PDF — malware analysis report

Static analysis result for SHA-256 a61bac91c855a2c4…

MALICIOUS

PDF

85.8 KB Created: 2021-03-25 12:59:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d74b92a02586687e42a988ac8fb5c347 SHA-1: 92bf2a6301abc2821c21e993ee3043a8ed55ae1c SHA-256: a61bac91c855a2c4e8523db4e19c651cea3fd9b539d0f36cbeaac773384e37dc
166 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The 'SE_PAYMENT_REDIRECT_LURE' heuristic indicates the document's content is designed to trick users into believing there are new or changed payment instructions, a common tactic in business email compromise attacks. The presence of external URIs, particularly one pointing to 'dugedepap.ru', suggests the document is intended to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://dugedepap.ru/123?utm_term=google+sheets+explore+machine+learning PDF link annotation
    • https://mitumeme.weebly.com/uploads/1/3/4/8/134879381/8623578.pdfIn PDF document text
    • http://taxiditugivubed.iblogger.org/proper_scholarship_essay_format.pdfIn PDF document text
    • https://jafekubu.weebly.com/uploads/1/3/0/8/130814731/60a7c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fazawafelu.rf.gd/90810379657.pdfIn PDF document text
    • https://599b09cd-7b6a-4758-94a3-08a08d316165.filesusr.com/ugd/628a76_6236c7d5dfc841459282d6d4e9015991.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pusolefosex/kunavaginelet.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/nurarukarutera.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/rosemount_3051tg_price.pdfIn PDF document text
    • https://f06ae689-34e6-4fd9-b749-a5985747e370.filesusr.com/ugd/4117a9_dcafcc424d074c6b9a8dff0bb9ae6ef5.pdf?index=trueIn PDF document text
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_96f1f9c4fe5f4da1b2aea76d200019ce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/rajitadufamozuva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f9fe50d-b93e-492f-a2b5-e5e35d8cfa32/4612862134.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21ac8d95-c458-41e7-9a19-b4e9f4d07f56/interior_design_software_programs.pdfIn PDF document text
    • http://fazafowunop.epizy.com/badaxoxekamuvibafe.pdfIn PDF document text
    • https://7fe6b731-3703-45da-bcbe-faf39b4d3392.filesusr.com/ugd/880a7e_146eadeda0b841dc9df9146d3823ead4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe5c5097-646b-4ed6-a517-f62a7c3e2cbd/3305150168.pdfIn PDF document text
    • http://kulekedeziwab.epizy.com/mens_platform_boots_size_12.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10479 5236 bytes
SHA-256: 6dcb9f366402b276a1e6f5cf3107fb11aaa05996f5462c1bc9bb6bb2c9243def
font_01_sfnt_off0001162b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162B 10972 bytes
SHA-256: 8279ab7515bac10f011e6aecfa4dc318ff234ac18f05af4e5421f1ac533a3f16
font_02_sfnt_off00013b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9C 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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