Malicious PDF — malware analysis report

Static analysis result for SHA-256 742db1cbf42a55e3…

MALICIOUS

PDF

92.1 KB Created: 2021-03-22 11:44:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 426b6c71fc7c43fac12e35c64e0948fc SHA-1: d6aa7e4af6d9033da910dca55ef7531f224c7741 SHA-256: 742db1cbf42a55e3fe81d748d32ff1b863ea761b7b656436f7997b57867ed07a
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the external URI strongly suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/wix?keyword=central+weld+water+district
    • https://static.s123-cdn-static.com/uploads/4459027/normal_5ffd0e6d3bf8f.pdf
    • https://cdn-cms.f-static.net/uploads/4413112/normal_60366508c9e7c.pdf
    • http://sks-expertiza.ru/86768226588op878.pdf
    • https://cdn-cms.f-static.net/uploads/4474752/normal_604919451ebb3.pdf
    • http://waystep.site/58180612738v3b00.pdf
    • http://laketofetujeso.medianewsonline.com/scratch_2_games.pdf
    • https://static.s123-cdn-static.com/uploads/4496810/normal_5fc5ca05a61f5.pdf
    • https://static.s123-cdn-static.com/uploads/4368489/normal_5ff04097e5cef.pdf
    • https://cdn-cms.f-static.net/uploads/4402953/normal_6057cb9228963.pdf
    • https://static.s123-cdn-static.com/uploads/4387242/normal_5ffb8097af90a.pdf
    • https://static.s123-cdn-static.com/uploads/4475872/normal_5fcecd6878003.pdf
    • https://cdn-cms.f-static.net/uploads/4380090/normal_603385863e822.pdf
    • https://cdn-cms.f-static.net/uploads/4418191/normal_604b13de19998.pdf
    • https://static.s123-cdn-static.com/uploads/4425224/normal_5fe2dbadc7330.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jeborawaleko.atwebpages.com/gedituvegux.pdf
    • https://uploads.strikinglycdn.com/files/428177c3-2a49-47c8-bec3-75e62c90fa96/the_adventures_of_tom_bombadil_book.pdf
    • http://taguloxutenafol.myartsonline.com/3099830521.pdf
    • https://uploads.strikinglycdn.com/files/8a9c7f72-a599-4a7a-b50a-65631d418fc7/how_to_unlock_scroll_lock_key.pdf
    • http://pupagerirawax.myartsonline.com/market_share_meaning.pdf
    • https://uploads.strikinglycdn.com/files/c4a31532-a095-43ac-bb3a-1b6e8b5f0a7a/4106879769.pdf
    • http://liraperuwuw.atwebpages.com/aeschylus_eumenides_summary_sparknotes.pdf
    • https://uploads.strikinglycdn.com/files/f7adac48-2437-4773-a430-8760ae89001c/ipad_mini_2_screen_replacement_cost_malaysia.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012919.bin
097364bfc8e3f78f80568880601d4d6c81c0b06cd380298d2c904434aecda031		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12919 4932 bytes
font_01_sfnt_off000139fc.bin
c86115249f6ab9b28ff9aeaa06fbe6f997f17f9663c19af67cdebe560ebd6c94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x139FC 12072 bytes

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