Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb75ba3a8bfbf45f…

MALICIOUS

PDF

70.8 KB Created: 2021-03-05 15:27:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: bd8abc1f3128e56eae5c63372293f034 SHA-1: 747556e474bde240f5824dd2178d3b0e39d5831c SHA-256: cb75ba3a8bfbf45ffbd9f0e15e8f3a57ff222b383d23bd1bc09df1031e8650df
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with one prominent URL pointing to a suspicious domain, suggesting a phishing or malware distribution lure. The PDF structure and embedded content are indicative of a link farm designed to redirect users to potentially harmful 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 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://maypoin.ru/strik?utm_term=boots+to+business+reddit PDF link annotation
    • https://soravetojovon.weebly.com/uploads/1/3/4/8/134890923/dedawinozez.pdfIn PDF document text
    • https://jikabokuw.weebly.com/uploads/1/3/4/6/134658058/baraxizuf.pdfIn PDF document text
    • http://instapriz.online/how_to_protect_tableau_workbookc9uw1.pdfIn PDF document text
    • http://counterman.ru/48030768392i8cnc.pdfIn PDF document text
    • http://bigonetudukori.iblogger.org/adventures_of_tintin_comics_free.pdfIn PDF document text
    • http://classkaod.ru/83754957978vr8yy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/72233316-670f-4835-80ca-6ab48b568248/can_the_razer_blackwidow_ultimate_change_colors.pdfIn PDF document text
    • http://zideniniwos.epizy.com/graphical_method_of_adding_vectors_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/555f8d5c-8fc1-4f28-a35d-1a3e5fa2f81f/644653955.pdfIn PDF document text
    • http://jifejibi.epizy.com/free_fun_writing_activities_4th_grade.pdfIn PDF document text
    • http://ginokaze.epizy.com/southern_literacy_test.pdfIn PDF document text
    • https://2eda13a9-9e0f-47dd-bbfa-a9a5028a3314.filesusr.com/ugd/61c57f_5bfe93cba1044319bb4aa29b6dabae5b.pdf?index=trueIn PDF document text
    • https://67a4337f-2b79-4d04-9c1d-2578c80f4945.filesusr.com/ugd/964009_1d03549559c049d5b286854bf631b3c1.pdf?index=trueIn PDF document text
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_563174fc05db47dbba8d5aa8be2797bd.pdf?index=trueIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_7eaf98c5f74b4faca51a4cddea3918c9.pdf?index=trueIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_c7107138f1974532b6cd3c373e1238f7.pdf?index=trueIn PDF document text
    • https://883cd1dc-02d0-4059-8fa2-99201f92b631.filesusr.com/ugd/6166c9_88684d4ee666489685d6b53ccd1960fd.pdf?index=trueIn PDF document text
    • https://d848e4b6-662b-4424-a759-963270729452.filesusr.com/ugd/30e015_ff9e4e5ae67e401a9fc76b5ed769d936.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8c0651f-3e5e-4027-bff8-3088081e4c8c/vusesubagodetigobomases.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_off0000d6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CB 4768 bytes
SHA-256: 36123254901eeff6c59de19a8eeed14b0ca33295b6bda11c34ca3b43d265b03d
font_01_sfnt_off0000e709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE709 10884 bytes
SHA-256: c67c8c0cb2b0e9270122d57dc0180ff39ea552a4009e06a4cc81efc82585484b

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