Malicious PDF — malware analysis report

Static analysis result for SHA-256 a806ff54f3a40998…

MALICIOUS

PDF

81.7 KB Created: 2021-06-01 00:37:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 47c47f895ea4fa3b744d19f293b76957 SHA-1: 2506114f5063208e501ae19de2c5f386df22607d SHA-256: a806ff54f3a40998d0b7c30b18b691387d45a72f32ac788c0b804a1e3948748b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable hosting or potentially malicious domains, suggesting a link farm or phishing lure. The document body is heavily obfuscated, but the presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a strong intent to redirect users to external 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://coretry.ru/pbw?utm_term=is+react+more+popular+than+angular PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413223/normal_5fdc6fcf55d6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446502/normal_60283ceeba50d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419235/normal_60024c4feb5c2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384142/normal_5fed3476df576.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471683/normal_5fd182bd3ac76.pdfIn PDF document text
    • https://nepexinis.weebly.com/uploads/1/3/1/4/131438592/pujojemodidid.pdfIn PDF document text
    • https://jugozufenuw.weebly.com/uploads/1/3/4/2/134266135/708bac1.pdfIn PDF document text
    • https://batuzuxiwanokan.weebly.com/uploads/1/3/4/3/134354003/2996117.pdfIn PDF document text
    • https://detasove.weebly.com/uploads/1/3/4/5/134594091/wujovokajininuk.pdfIn PDF document text
    • https://xamifixi.weebly.com/uploads/1/3/1/8/131871938/c1893b9369.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sepaxebi.pbworks.com/w/file/fetch/144428925/does_tmobile_give_free_hotspot.pdfIn PDF document text
    • http://gajufabeke.pbworks.com/w/file/fetch/144423336/80452781275.pdfIn PDF document text
    • http://garigor.pbworks.com/w/file/fetch/144428820/vocab_prodigy_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e32796ee-a8c8-4e3c-b888-9f04a43b69c3/zubinanuragukiwufufo.pdfIn PDF document text
    • http://vowujepojez.pbworks.com/w/file/fetch/144428733/wujebep.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144422145/subaru_forester_manual_transmission_years.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c8b556f-3dc9-4933-8c64-770ece58db2d/pumitadujoxobejosofaboruk.pdfIn PDF document text
    • http://tagexoba.pbworks.com/w/file/fetch/144423246/how_to_use_excel_for_daily_expenses.pdfIn PDF document text
    • http://vowujepojez.pbworks.com/f/74870125501.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_off00010324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10324 5284 bytes
SHA-256: b8be48773e41f332dfe70c96f5fca99dd0bf7bf9be8e69458de6f4987bfda4eb
font_01_sfnt_off000114ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114EC 10704 bytes
SHA-256: fd731f42d36c6ca895421724ec809180d5cb270c1f941275f897985802621edd

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