Malicious PDF — malware analysis report

Static analysis result for SHA-256 410a62e51474658a…

MALICIOUS

PDF

71.3 KB Created: 2021-03-19 14:46:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 693510fe4e5f71e85aa5bd9fb42acc95 SHA-1: 7c19b01b4b35551618a575897554d9b8c77be88c SHA-256: 410a62e51474658a9beba79e25491f932c8e24f1f9de1e4babfcd84930466628
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, including one to 'vilenefex.ru', suggesting a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/wix?keyword=tower+defense+minecraft+unspeakablegaming
    • https://static.s123-cdn-static.com/uploads/4409827/normal_5ffc488b98d66.pdf
    • https://cdn.sqhk.co/tiviluluje/hPPifgg/boruwatazajuneguzizafoj.pdf
    • https://cdn-cms.f-static.net/uploads/4459478/normal_60386f068415c.pdf
    • https://cdn-cms.f-static.net/uploads/4416131/normal_60527f0f9bad4.pdf
    • https://cdn-cms.f-static.net/uploads/4495390/normal_60378efa33141.pdf
    • https://cdn-cms.f-static.net/uploads/4403276/normal_6040691f9170c.pdf
    • https://cdn.sqhk.co/tezizejaropu/Voghggs/85659573743.pdf
    • https://cdn-cms.f-static.net/uploads/4477655/normal_603233c2f18ec.pdf
    • https://cdn-cms.f-static.net/uploads/4425507/normal_604cc398dc31e.pdf
    • https://cdn.sqhk.co/nogegamapagi/hfjc9Ez/nutaxotapino.pdf
    • https://cdn-cms.f-static.net/uploads/4456379/normal_5fd274e49d04a.pdf
    • https://cdn.sqhk.co/samekikogeri/ihjjCic/papurov.pdf
    • https://cdn.sqhk.co/lofujumixas/jijVhhQ/gedefatinarusepevoxorob.pdf
    • https://cdn-cms.f-static.net/uploads/4489440/normal_5fe7a2fa467c5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zubuwujoxom/air_force_1_pixel_trainers_particle_beige_particle_beige_black.pdf
    • http://femubixipo.rf.gd/67752785016.pdf
    • https://s3.amazonaws.com/falevi/44429208076.pdf
    • https://s3.amazonaws.com/bidivo/71818832993.pdf
    • http://lemuguta.rf.gd/19480250052.pdf
    • http://lumuwejonalar.epizy.com/fukabenugukusibekatexir.pdf
    • https://354df738-7a8c-4643-bdcd-aa58f7c4bd0c.filesusr.com/ugd/69cf62_625fd194ef954539b35a14c6e7e9a0a9.pdf?index=true
    • https://s3.amazonaws.com/xepululejiwof/adding_fractions_with_different_denominators_word_problems_worksheet.pdf
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_76b3e77245354d67bdc109f167dfa947.pdf?index=true
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_692ff1b47eeb446da12068e79717f172.pdf?index=true
    • https://s3.amazonaws.com/mukutud/kidde_smoke_detector_beeping_2_times.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_off0000d7cb.bin
47e75913a7f82fccc4dd85607fa08e92c60786af8d51a47d759bf5acae9fab24		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CB 5720 bytes
font_01_sfnt_off0000eb41.bin
18e61ecdfaca8cdbd6d02c8b2c55174d75793bbe48690c4353d013a20f3f6b6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB41 10532 bytes

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