Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c3726c4df8180d…

MALICIOUS

PDF

71.8 KB Created: 2020-12-29 21:52:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb5e93550f1f3a97a1000927ed4db307 SHA-1: d4feca42e4e933d9baca7254214c50510f4d64cb SHA-256: c9c3726c4df8180db9d161163704adb2c4f51b55c797a80888cab242dc089b90
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains an embedded URI pointing to 'trafffi.ru', which is flagged as suspicious. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of an external URI in a PDF commonly indicates a phishing or malware distribution attempt. No scripts were extracted, but the overall structure and the suspicious URL strongly suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/123?utm_term=lucia+jordan+libros+pdf
    • https://cdn-cms.f-static.net/uploads/4375351/normal_5f8c75f8ac9e0.pdf
    • https://cdn.sqhk.co/tajiwikiter/gsgfFic/56344232749.pdf
    • https://cdn.sqhk.co/taxeseta/Mgfgiic/zumizujoginitebojulefag.pdf
    • https://cdn-cms.f-static.net/uploads/4422373/normal_5f97582611c36.pdf
    • https://cdn-cms.f-static.net/uploads/4452169/normal_5fa0a8086f540.pdf
    • https://cdn.sqhk.co/tiwumixe/d7gejc5/all_star_weekend_basketball_shoes.pdf
    • https://cdn.sqhk.co/ludafojebi/RY7ygdx/printable_coloring_pictures_of_wild_animals.pdf
    • https://cdn-cms.f-static.net/uploads/4426263/normal_5fc07f489b9e1.pdf
    • https://cdn-cms.f-static.net/uploads/4413120/normal_5fd3bfaec1103.pdf
    • https://static.s123-cdn-static.com/uploads/4451021/normal_5fcf4b2cd5ff1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/faluzotixupi/how_in_spanish_slang.pdf
    • https://s3.amazonaws.com/febopa/xamarin_forms_stacklayout_background_color_transparent.pdf
    • https://s3.amazonaws.com/vukumesoj/walufi.pdf
    • https://s3.amazonaws.com/ronenitevodo/delmarva_power_report_street_light_outage.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_off0000ddd1.bin
3de4df2de9d4f777b07ce8f2a0a2c39ad1a68d2faa881bdce36f90055649d6ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD1 5308 bytes
font_01_sfnt_off0000efed.bin
109369e374adabb02f2f072e2a27abb16fb8c2acd5a10c3582fa09c49b6ded88		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFED 9752 bytes

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