Malicious PDF — malware analysis report

Static analysis result for SHA-256 74425ea857af6bc2…

MALICIOUS

PDF

73.2 KB Created: 2021-02-28 17:15:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: a21f841a96774fa9ba4ca391d8105282 SHA-1: e1883f1e62e69002f8fcc6cea7d1036087dbac9e SHA-256: 74425ea857af6bc2b12ba169122da32df8a1c438ddd0eb5e61ba91bc60f089bf
126 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs, with one specifically linked to an 'award' keyword, suggesting a phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, but no direct instructions or content that would clarify the exact nature of the lure beyond the URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/award?keyword=roomba+960+map+unavailable PDF link annotation
    • http://future-techno.ru/jarutigadiwopuserajerurizbym7r.pdfIn PDF document text
    • http://7lessons.space/how_to_sort_columns_in_pivot_table_manuallyb9212.pdfIn PDF document text
    • http://zibepifutidi.sportsontheweb.net/ponenosusanekamaji.pdfIn PDF document text
    • http://kujunat.medianewsonline.com/how_hard_is_the_comptia_server_exam.pdfIn PDF document text
    • https://sevanilab.weebly.com/uploads/1/3/1/4/131437268/nopobibov_ferovidaburak_gepip_mexajuzigat.pdfIn PDF document text
    • http://how2clever.com/71280935908057b8.pdfIn PDF document text
    • https://xofezariro.weebly.com/uploads/1/3/1/8/131871505/gubilele.pdfIn PDF document text
    • https://fukusegoboviv.weebly.com/uploads/1/3/1/8/131856281/nikikakijo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wenares.myartsonline.com/29074792191.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/torewadefewamit.pdfIn PDF document text
    • http://wokoziguroron.rf.gd/2253072806.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD0E 5348 bytes
SHA-256: 7280cc21b47c558ca35c2f7cd1abe33f8942fca2589310c055a1ae7980f8462e
font_01_sfnt_off0000df26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF26 10264 bytes
SHA-256: 53088bd38eba79bf0a495fd4ee82c53fb7026da7ee310b796f12038ec58ed9c0
font_02_sfnt_off000102b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B7 16084 bytes
SHA-256: e8051d68498e63029d7c34361d406bcd46815681d18da0e8952f0660ee027cca

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