Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff6f2a771a00c109…

MALICIOUS

PDF

79.0 KB Created: 2021-03-24 18:34:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e3b939c98fff5dd0476342b9e151e37 SHA-1: aa6e3ac138b41e62757da086d15010f7572489e6 SHA-256: ff6f2a771a00c1091546afe6735d49bf9c6afcd20928f4af200aaf483709dc38
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to 'kuzutuzo.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or redirection mechanism. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent. While no scripts were directly extracted, the structure and link farm behavior are indicative of a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/strik?utm_term=karcher+high+pressure+cleaner+user+manual
    • http://kismykeitio.best/bank_5_routing_numberbnx82.pdf
    • http://presalon.xyz/briggs_and_stratton_engine_manuals98i9b.pdf
    • http://vnatural.space/89218663137kgv1h.pdf
    • http://scrlt.xyz/nenosovuduguzpyx.pdf
    • http://tugrull.com/968741608786g4ht.pdf
    • http://storeeu.info/toradol_davis_drug_guideczwmh.pdf
    • http://ig-verifiedsbadge.com/english_to_gujarati_dictionary_translation_online_tamilcubemq9h9.pdf
    • http://originalhallyu.com/pipikozulujosuredizituguz5e2ia.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6cbe2f5c-748b-4bc6-b691-25a968a47885.filesusr.com/ugd/d6b5da_544a9b2fa3de4886bd9208682210a376.pdf?index=true
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_c36616e66415405c84c3127bc73afd3f.pdf?index=true
    • https://fccd5518-64e1-462d-9dbe-8d8d8a19ca7a.filesusr.com/ugd/eb005d_0461b6adb07a434fadd22f29d31956df.pdf?index=true
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_356545e4052b46b5ab1cdd5c8e967a18.pdf?index=true
    • https://s3.amazonaws.com/sugowubuf/tamil_movie_box_office_report_2019.pdf
    • https://s3.amazonaws.com/lovetijif/safiromobafonabako.pdf
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_9094c04c8a4b4eedbfb2461819282075.pdf?index=true
    • https://691dfa98-c543-4342-b77d-a3d7fbf094aa.filesusr.com/ugd/d55835_88e563915ca545ff93d821e7dccf9f58.pdf?index=true
    • https://s3.amazonaws.com/gazivemon/netters_surgical_anatomy_and_approaches_download.pdf
    • https://s3.amazonaws.com/sosupejuxofedo/informacin_de_serpiente_de_cascabel_en_ingles.pdf
    • https://s3.amazonaws.com/xugigabitulu/washing_machines_repairs_near_me.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_off0000f584.bin
d64bcb08e5179639f9bdbbd702103b9463c2b5fce6d42ef9eb84b03725d5896e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF584 5316 bytes
font_01_sfnt_off00010776.bin
cfc0c32a5ab2b18ce8926ccbbdef4dd2bec27e255b6fb11376a228783adff781		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10776 11652 bytes

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