Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ad5c43980223f59…

MALICIOUS

PDF

87.3 KB Created: 2021-02-24 23:43:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 626b08d848360c9e52229d175a1e47b1 SHA-1: 282f9f7bee86d6291c024b1e83969d8c3aed3caa SHA-256: 9ad5c43980223f59d726b4e76488308cdedee4eeba7ee84ec7373e39256b3eef
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external URIs pointing to disposable domains and link farms, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the PDF structure indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/wb?keyword=rii%20mini%20i8%20bluetooth PDF link annotation
    • https://sepuzudagek.weebly.com/uploads/1/3/5/3/135329554/4016383.pdfIn PDF document text
    • https://gokavebaraxev.weebly.com/uploads/1/3/5/3/135309677/290732.pdfIn PDF document text
    • https://xanivumukil.weebly.com/uploads/1/3/1/8/131856382/webaxupu_durudukof_zodowawiv.pdfIn PDF document text
    • https://cdn.sqhk.co/wewisadavoj/jfBijid/space_docking_simulator_online.pdfIn PDF document text
    • https://cdn.sqhk.co/lilavokolet/Ybbidjh/falling_inn_love_movie.pdfIn PDF document text
    • https://lazumuron.weebly.com/uploads/1/3/4/8/134863931/mibukerase-rusumojegujen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459180/normal_6029555437bb5.pdfIn PDF document text
    • https://rozutawupev.weebly.com/uploads/1/3/2/6/132695629/6504698.pdfIn PDF document text
    • https://cdn.sqhk.co/xutujipux/gdIPiau/sebidug.pdfIn PDF document text
    • https://kenojitoxudu.weebly.com/uploads/1/3/1/3/131383977/5ac078929b8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://manosotidokef.myartsonline.com/jijodunoxijonojima.pdfIn PDF document text
    • http://pujumek.myartsonline.com/is_breath_of_snow_and_ashes.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_off00011410.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11410 4780 bytes
SHA-256: 5319171d509c2273ac332b9e50d87001bc56be8eb32b8fce2c88f9ebcaf96b88
font_01_sfnt_off0001242e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242E 13484 bytes
SHA-256: 61bad165b8db5ec73065e10dd225e96caa7d88e09758e2445557850bd721ce3a

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