Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb602ef1683113bb…

MALICIOUS

PDF

82.0 KB Created: 2021-03-23 21:11:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b2c48812ad4eb8ec5133492ceb77bde2 SHA-1: b76d5041cb8f6dd25fb2a1373d4af64d5dad4acc SHA-256: cb602ef1683113bb7631816cdc32e69f8c28b89e540142d052a322d562130bc9
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. It contains a large number of external links, many of which are likely part of a link farm or SEO manipulation scheme. The document body, though heavily obfuscated, suggests a lure related to a 'U-boot user manual', likely to trick users into visiting the linked sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dafemum.ru/wix?keyword=u-boot+user+manual
    • http://wojemumeba.iblogger.org/vedetapoz.pdf
    • https://cdn.sqhk.co/wisaputal/ehd4Njf/lalaboge.pdf
    • https://cdn.sqhk.co/zokosofu/gg2hdih/ludo_king_app_is_from_which_country.pdf
    • https://kokonasaza.weebly.com/uploads/1/3/1/6/131636703/timuwip-bowinijaroju.pdf
    • http://kirakexig.mypressonline.com/22429239727.pdf
    • http://bevurib.22web.org/how_to_start_moonshine_business_rdr2_online.pdf
    • https://cdn.sqhk.co/giganopof/gjfu0jh/best_army_combo_clash_of_clans_th9.pdf
    • https://cdn.sqhk.co/vugomupuzisa/gzgj6wE/zedge_download_app.pdf
    • https://cdn.sqhk.co/rinovizifim/eiajiif/cleveland_clinic_cardiology_board_review.pdf
    • http://jinosewifuwefe.22web.org/titas.pdf
    • https://cdn.sqhk.co/rivotoxupow/ceiegih/can_you_bake_italian_breaded_chicken_breast.pdf
    • https://kumajevebak.weebly.com/uploads/1/3/1/8/131856027/4776255.pdf
    • https://cdn.sqhk.co/dumudegurit/Tjgggr4/big_bird_landscaping.pdf
    • https://cdn.sqhk.co/susojareb/ibjedV4/my_room_smells_like_fish_tank.pdf
    • http://bumululoru.mywebcommunity.org/36808535759.pdf
    • https://cdn.sqhk.co/risubibasero/ijdN4je/airplane_mode_android_cell_phone.pdf
    • https://cdn.sqhk.co/givifevulo/jevgghp/19377878497.pdf
    • http://jefevivavifax.scienceontheweb.net/how_to_make_climate_diagram.pdf
    • https://cdn.sqhk.co/marixefe/Y4MvhaU/54058411589.pdf
    • https://cdn.sqhk.co/lenufetimop/ehdOJ2X/79153057409.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zusewijoje.epizy.com/allahabad_state_university_exam_date_sheet_2019.pdf
    • http://mawanujabizeba.rf.gd/miller_bobcat_225_metal_cover.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_off00010350.bin
423272cfd3b070f4b3c20a6509baef68e558010d0ee2e575c363f163eae50449		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10350 4992 bytes
font_01_sfnt_off00011434.bin
ff5420635c54901874a82d1cef0ceb824bf8e442313b1cda6de7cef261236e22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11434 11196 bytes

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