Malicious PDF — malware analysis report

Static analysis result for SHA-256 617da1c50dc11a94…

MALICIOUS

PDF

78.2 KB Created: 2021-04-05 01:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6e99af5ad5afbaa10011c645ea7c92b SHA-1: d27765ab4e73a89835e0cb5fdc93dc3ec277edbb SHA-256: 617da1c50dc11a94396c8877c9c7232e9789708a5f44adef28afd7f6032df393
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a critical heuristic identifying it as a link farm designed to host many external PDF files. The primary malicious URL identified is `https://mezovuduw.ru/award?keyword=be+simple+past+pdf`, which likely serves as a lure or a distribution point for further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

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://mezovuduw.ru/award?keyword=be+simple+past+pdf
    • https://gibejeki.weebly.com/uploads/1/3/1/4/131438187/rujutul_xazifum.pdf
    • https://pigaxusimip.weebly.com/uploads/1/3/4/5/134584788/2706613.pdf
    • http://maykistore.ru/buland_darwaza_short_information6x467.pdf
    • http://art-practice.org/ludikabiluzafowumebimanej0qcre.pdf
    • https://xuzopodoker.weebly.com/uploads/1/3/0/7/130738955/puzekewixufilos-tipefafok-kikuxixeta-siwuzixubef.pdf
    • http://greyfruit.space/brahmarshi_vishwamitra_movie_songs_freexkc2e.pdf
    • http://uscarinsurance.info/912183648576o75o.pdf
    • http://requiredjokblog.com/filtre_analogiqueb9ne0.pdf
    • https://dikivofugejal.weebly.com/uploads/1/3/1/4/131453076/zapofope_bumarikukizel_durunuzanaze_kawofi.pdf
    • https://lamuwopinu.weebly.com/uploads/1/3/4/6/134632291/56b9a354.pdf
    • http://gratoraama.website/hollow_man_2000_full_movie_hindi_downloadj06n2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/suzujewa/52987553226.pdf
    • https://ec679cc6-872a-45a8-b2fd-b1bc8f6ddb77.filesusr.com/ugd/d1d005_7fe3adf9f45642e7aead2141eef0b833.pdf?index=true
    • https://6c639bf1-704a-4500-b661-329758898742.filesusr.com/ugd/02d620_72bdd3f5f8c84b85af7ea9ed43e6f7dc.pdf?index=true
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_53e4f89999fd487e8df314e33d9f3c68.pdf?index=true
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_5150c26af36b424c90dffe9fb1d832dc.pdf?index=true
    • https://s3.amazonaws.com/dowadotiju/fe_mechanical_practice_exam_online.pdf
    • https://s3.amazonaws.com/tosevud/wosidaziril.pdf
    • https://s3.amazonaws.com/petikamov/pulogit.pdf
    • https://3a00e800-a8eb-44ae-aafc-ae9aecab8e06.filesusr.com/ugd/1715bf_41842f952174448a86dbdf6fedfb8f9c.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_off0000f0b9.bin
9dc9435058574dff1b4487ec86263d84e008a9d7eda3f14a2542feb4629f1895		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B9 5140 bytes
font_01_sfnt_off00010226.bin
2e57eed877cc038fd5ed37a859675344aed99952f8110b0c9db89a5a95459d4a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10226 13080 bytes

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