Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9fda29bc905c187…

MALICIOUS

PDF

78.5 KB Created: 2021-02-25 01:12:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2dee57e76c79866fe7cc08fccd7a2ac6 SHA-1: 2c4970f77157025f5c293b7e2b21c673e2b35404 SHA-256: a9fda29bc905c1878d14682934ed142cfec3559fff90d34ed2cde9b5b482368f
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to 'Super Mario RPG boss guide' and the authoring application 'wkhtmltopdf', which is often used to generate malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/wix?keyword=super+mario+rpg+boss+guide PDF link annotation
    • https://cdn.sqhk.co/tibakekavero/fgiaibB/nekuxikufip.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/the_curious_writer_brief_5th_edition_free.pdfIn PDF document text
    • http://giwapozolaleg.mypressonline.com/xawamuko.pdfIn PDF document text
    • https://cdn.sqhk.co/muruwake/REkdWM9/teachers_assistant_certification.pdfIn PDF document text
    • https://cdn.sqhk.co/kilatelazobe/3icqggd/ruvuteweguluko.pdfIn PDF document text
    • http://rubewox.sportsontheweb.net/tivo_slide_pro_remote_manual.pdfIn PDF document text
    • http://leledup.mypressonline.com/vizio_e601i-a3_apps.pdfIn PDF document text
    • https://cdn.sqhk.co/padixemugex/hbJgjNr/3017642349.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/book_hotel_24_hours.pdfIn PDF document text
    • http://cashbackk.site/tabla_de_formulas_para_derivadasomd3h.pdfIn PDF document text
    • https://cdn.sqhk.co/remigalakefo/65hby6m/magic_dream_tiles_download.pdfIn PDF document text
    • http://taforojujutusig.mygamesonline.org/descargar_musica_anthony_santo_en_vivo.pdfIn PDF document text
    • https://cdn.sqhk.co/lusimalifa/iigpjcx/freeciv_port_5555.pdfIn PDF document text
    • http://rexonina.medianewsonline.com/71573537373.pdfIn PDF document text
    • https://cdn.sqhk.co/xenudipu/gTMiffH/new_guitar_love_ringtones_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/lixijadimit/hfgghiZ/fitness_ball_workout_for_seniors.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/87479815096.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/xavoku.pdfIn PDF document text
    • http://nabenejajoko.myartsonline.com/tetesodosogatavifikeru.pdfIn PDF document text
    • https://s3.amazonaws.com/norozovijalu/busuu_premium_apkpure.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/zevamoxavo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF780 5492 bytes
SHA-256: 70653163aac6585b103718dc9e9927d5f390e5519c331b39a10d7b277cb11769
font_01_sfnt_off00010a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 10044 bytes
SHA-256: 625bd6919ca1e97bb3589e58e34adb837d61b68315f31ad31f4034aad702f0a3

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