Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d0ac4afecd1076f…

MALICIOUS

PDF

75.3 KB Created: 2021-04-17 03:43:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 8520a157d5e5a932f9f4fd60ab887b44 SHA-1: fecb3b43e5dc0d998db0693acf8e1017dfc37cb3 SHA-256: 1d0ac4afecd1076fced105f4a00e65c95a0f4cd5012a07b60abc22c62f68c013
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a deceptive lure related to investment banking books.

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://vilenefex.ru/strik?utm_term=best+investment+banking+books+for+beginners PDF link annotation
    • http://fito4ka.xyz/black_criminal_defense_attorney_in_houston_txfsfbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461767/normal_6045f7041d8c9.pdfIn PDF document text
    • http://detonic-romania.website/76664917628vsvbp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383572/normal_602e2ff216a27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463002/normal_6011e4afd0e35.pdfIn PDF document text
    • http://trujillostacoshop.com/binder_spine_templates_2_inchl7ddx.pdfIn PDF document text
    • http://verifybadgesbusiness.com/juice_bar_training_manual2ltv0.pdfIn PDF document text
    • http://accueilcmb.com/6534753429293yhr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414687/normal_605f35ef16b1a.pdfIn PDF document text
    • http://es50off.pro/pedubogividopuai9qp.pdfIn PDF document text
    • http://crysety.xyz/defects_of_character_worksheetxw5wz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459322/normal_5fc6e0dc6b044.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479673/normal_6004bbc341a14.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xetobagog.rf.gd/logitech_mk710_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd28741e-087c-464e-8306-31bec6ba4163/sitajeziwulopubozodaroni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e9a5ecd-b042-48e7-83cf-6d31f239cb30/zokezerime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18a2adbb-8491-4744-b210-f5673018a152/12741227200.pdfIn PDF document text
    • http://limibulat.epizy.com/8958109677.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/877726e3-8920-438e-a5a6-631f87b9d509/kunofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27c9a5a4-89a1-4dfb-bcd2-a17542199f7e/minecraft_bookshelves_mod.pdfIn PDF document text
    • http://weferobiditikun.epizy.com/lalovimijopotorube.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_off0000e83d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83D 5368 bytes
SHA-256: 1c00bc653e86645aab51315cc35927c5b3aaca55fa18a2cbfb7d92525224a517
font_01_sfnt_off0000fa7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 11000 bytes
SHA-256: 9ca2c91a4a4c7f35c97e2288cfc4f611805f2b51ce85b60ed2055090c82639a6

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