Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb760986691f443…

MALICIOUS

PDF

79.8 KB Created: 2021-03-16 19:58:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d1b9e0adc5eb70851c21050f5b46861 SHA-1: 5ddf77b066f448b6d417ebf2177d790056210462 SHA-256: cfb760986691f443c5f67da6f28e62bc00dd60c5afcb11b11f5450688ac1d83a
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains numerous external links, including one pointing to 'lozipotod.ru', which is likely part of a link farm designed to distribute malicious content or phish users. The PDF structure and embedded links suggest an attempt to direct users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/wix?keyword=last+empire+war+z+strategy+hack+apk
    • https://cdn-cms.f-static.net/uploads/4413223/normal_602e85366a055.pdf
    • https://cdn-cms.f-static.net/uploads/4422659/normal_605021ac21275.pdf
    • https://static.s123-cdn-static.com/uploads/4499935/normal_5fe1f7d73ebb6.pdf
    • http://didazema.mypressonline.com/zidebekututojom.pdf
    • https://cdn-cms.f-static.net/uploads/4368500/normal_5fd158c65b780.pdf
    • https://static.s123-cdn-static.com/uploads/4417314/normal_5fdefad6ce6b7.pdf
    • http://xinuvaro.sportsontheweb.net/rejaroxuzajijanifuna.pdf
    • http://belkwigs.com/digapagujejorebifpxfv.pdf
    • https://cdn-cms.f-static.net/uploads/4454546/normal_5fe666a3c3755.pdf
    • http://suvekitubexeso.getenjoyment.net/decision_tree_algorithm_in_machine_learning.pdf
    • http://rafupofamurawaf.mygamesonline.org/vinubapiwojimosarapuji.pdf
    • https://cdn-cms.f-static.net/uploads/4413011/normal_602ad2842aa0a.pdf
    • https://cdn-cms.f-static.net/uploads/4369499/normal_603e7d787206f.pdf
    • https://cdn-cms.f-static.net/uploads/4456712/normal_604b052df02b7.pdf
    • http://insurancecarusa.com/lease_amortization_schedule_with_residual_value_templateqzatb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/remufuzu/25909731116.pdf
    • https://s3.amazonaws.com/rezugekolaba/26926032540.pdf
    • https://s3.amazonaws.com/jarirotexab/da_bomb_final_answer_recipe.pdf
    • http://pizuzol.onlinewebshop.net/best_architecture_software_2020.pdf
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_221b774850094d2f845e2aee8f5b14a3.pdf?index=true
    • https://s3.amazonaws.com/gumegulaxi/reasoning_ability_solving_tricks.pdf
    • https://9042e326-c85f-44e6-b9b6-0c206471fdba.filesusr.com/ugd/0d2fda_ea83253f8234450fb910d80687ab01c6.pdf?index=true
    • 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_off0000ed24.bin
d7e289b60f78309bced8b2d469124b12136f9806879f43784ec8d361d909e5b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED24 5564 bytes
font_01_sfnt_off00010012.bin
38708b584acb07afca01791c656316f156c814d5c1a113fba1ceb7e71544e7ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10012 21908 bytes

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