Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b6f0864eeff28c0…

MALICIOUS

PDF

70.0 KB Created: 2021-02-17 21:53:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 315a51f1bf1b557e52fb21d7a048aea1 SHA-1: 1c0c2ec15eff03192693ffc9170c378add4ef7e3 SHA-256: 8b6f0864eeff28c05159ae4454fcdad64c6b05d7592aee4f8ecca7c583332451
126 Risk Score

Malware Insights

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

The file is a PDF that contains numerous embedded URLs, many of which point to disposable domains or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://maypoin.ru/123?utm_term=safety+first+car+seat+setup
    • https://cdn.sqhk.co/vixawutozama/shjiajc/subway_train_adventure_2016.pdf
    • http://spoonnumberone.xyz/450255456v8t57.pdf
    • http://hopecommunitynaz.com/899468294754g5bl.pdf
    • http://balifruit.com/gudanixubovunaloviwx9ev3.pdf
    • http://shmelev.pro/302122038244zk8w.pdf
    • http://seplafond.xyz/83620208151picqg.pdf
    • http://tenegijo.iblogger.org/aankhon_ka_kajal_song.pdf
    • https://cdn.sqhk.co/perigupa/joghjcF/33475866111.pdf
    • https://cdn.sqhk.co/nivodoruw/g53jf4C/home_naturals_fruit_wood_cutting_board.pdf
    • https://cdn.sqhk.co/sifajoxojif/jiqN2jh/goladeva.pdf
    • https://static.s123-cdn-static.com/uploads/4447640/normal_60079e9aabbbd.pdf
    • http://zebaxuf.iblogger.org/xilafebexaturovug.pdf
    • http://jelelegukawox.22web.org/horse_riding_tales_mod_apk_android_1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gitinilu.epizy.com/darkness_rises_assassin_pvp_skill_guide.pdf
    • https://s3.amazonaws.com/gowupuzokowuxes/48259483768.pdf
    • http://gizimup.epizy.com/fetal_akinesia_deformation_sequence_wiki.pdf
    • https://s3.amazonaws.com/lorugipopuxe/ip_camera_scanner_apk.pdf
    • http://robebiwasufilu.epizy.com/ripon.pdf
    • http://kutegabirena.epizy.com/android_vs_ios_market_share_worldwide.pdf
    • http://kokibitumoxa.epizy.com/annual_report_of_tcs_2017-_18.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_off0000d62c.bin
cd237d04bcc7802c94f6d2399c2c0cc9d9db7836385ba23ef69f80ddec250f04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD62C 5180 bytes
font_01_sfnt_off0000e7ec.bin
03a8ce8c60f12ebd6c47bc570aa6112ee859f92a890d8b58811a9e6d471a7bce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EC 10248 bytes

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