Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f2d219b0ba1c47…

MALICIOUS

PDF

71.6 KB Created: 2021-05-16 20:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1ecbccef9583ccea49d4fdc4e4b39ad7 SHA-1: e4304e959f197fd2d0d1edb5eeef3f3867f496ca SHA-256: 61f2d219b0ba1c475345b627d4c08256a6ae5c8b9d58aad1963514c11d430107
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of embedded links, many pointing to disposable domains, indicating a link farm or phishing attempt. Heuristics like PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM strongly suggest malicious intent. The ML classifier and ClamAV detection further confirm the malicious nature of the file, likely serving as a lure to redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://dafemum.ru/strik?utm_term=vermont+castings+defiant+encore In PDF document text
    • http://bigmagazin.xyz/nota_bimasakti_menariipqkz.pdfIn PDF document text
    • https://cdn.sqhk.co/nosimasiv/92eQggS/farm_world_roblox_how_to_get_animals.pdfIn PDF document text
    • https://cdn.sqhk.co/gotakavapu/9Ajaia2/worm_game_pc_free.pdfIn PDF document text
    • https://cdn.sqhk.co/pupevadojas/Biex0jf/pututimigax.pdfIn PDF document text
    • http://esclub.pro/66046081126tguk.pdfIn PDF document text
    • http://alkim.xyz/acca_student_jobs_in_uk6po7l.pdfIn PDF document text
    • https://cdn.sqhk.co/pigexebobe/McE0heX/46962849445.pdfIn PDF document text
    • http://upgrade4me.com/21045038556x0uvj.pdfIn PDF document text
    • http://mandarin-fruit.space/zujologugobesadnkbv.pdfIn PDF document text
    • http://reetodo.online/migikiretijuxifemigowamez80qf.pdfIn PDF document text
    • https://cdn.sqhk.co/jewipabefoji/Ljghgkz/doxaxuxoxazefonawol.pdfIn PDF document text
    • https://cdn.sqhk.co/melalisopapu/7Tdgggi/super_bomberman_5_rom_usa.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/cdha2ib/basier_circle_font.pdfIn PDF document text
    • http://winoorama.fun/land_bridge_theoryi991w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_714f505b33ee4a08a000220fdecbf141.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/daxemo/jixutaropedidowifavasuxep.pdfIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_7402b6f47999429182909d9dd548f05b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/nojulebemizeke.pdfIn PDF document text
    • https://s3.amazonaws.com/jolozidabi/batman_comics_for_sale_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/akash_name_ringtone_fdmr.pdfIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_a06a43b9b6284912b0e672d5dc66dbaa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/delomowikapo.pdfIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_7233125424b24c3da3a7889a6b4d5a0d.pdf?index=trueIn PDF document text
    • https://ef4b221f-cfb4-47e8-bf1d-3b5092770df7.filesusr.com/ugd/4948da_be72b778cf4342eb8d20f3c9944e0b7e.pdf?index=trueIn 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_off0000d824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD824 5276 bytes
SHA-256: 1ce1ad303b69072e23ef68fc419ce6b40a906e8f59d454218dc8d567376ea464
font_01_sfnt_off0000ea01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA01 10772 bytes
SHA-256: a290fd7d444450ff662644d819d58b371a81ef11b88b5ae76276ee5631e52f40

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