Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc232199d6a7b9a…

MALICIOUS

PDF

72.4 KB Created: 2021-02-02 19:27:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 361ba1fd927f6f32ac1626b8b92064b2 SHA-1: 53ff25d4c8eae1b3b77cdf62d7b9a66d19ed9ff7 SHA-256: 1dc232199d6a7b9a9d24e1fc147324044632ece99dc65251140bd2a2ef0f8a91
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URIs, with at least one heuristic identifying it as a link farm on disposable hosting. The primary attack pattern involves directing users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=boggle+dictionary+text+file
    • http://zirosax.iblogger.org/63951889149.pdf
    • https://cdn.sqhk.co/nebafaveju/jcoRvpk/gun_strike_shooting_game_mod_apk_unlimited_money.pdf
    • https://wipemaxo.weebly.com/uploads/1/3/5/3/135345075/faxabemidironog.pdf
    • http://midazimika.iblogger.org/jidipevemib.pdf
    • https://cdn.sqhk.co/nudizodi/jjj8ijV/44330622012.pdf
    • https://cdn.sqhk.co/sojowidaz/hgwxhe4/wemovirobawisikotusosibun.pdf
    • https://cdn.sqhk.co/pikukafil/miiiihj/beach_ball_buzz_questions.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xafamikipu.epizy.com/arduino_mega_adk_rev3_pour_android.pdf
    • http://xojakejib.epizy.com/54607859480.pdf
    • http://fofiwufawiparug.epizy.com/vajemujelaferemefawuwi.pdf
    • http://dovagoxaluzof.rf.gd/mawaxowifuwe.pdf
    • http://fekalalorupip.rf.gd/adjective_form_of_law-_abiding.pdf
    • http://tisimutugixaji.rf.gd/divas_can_cook_chocolate_sheet_cake.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_off0000daa0.bin
a09222d827f3f1ce76581132ba7c6cc947d80a5c4b32912247fd5bc3891892d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA0 5228 bytes
font_01_sfnt_off0000ec8e.bin
26126e9260a70d2468a02ae21428e952e097cf16020e17ea4f920ba8fef23bf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8E 12144 bytes

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