Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa45549bb285f5a3…

MALICIOUS

PDF

86.9 KB Created: 2021-04-03 13:47:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: d616e8a9c6f00a697d1768b5fd6ad40a SHA-1: cbeb8df30317080b59d76a3f4005112df86bd5aa SHA-256: fa45549bb285f5a3818820929ee60a668b0b07722266680793d1d12c0dfb4e96
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URIs, with one prominent URL pointing to 'jacksth.ru', suggesting a redirection to a malicious site. The PDF structure and embedded content indicate it's part of a phishing campaign, likely delivered as a spearphishing attachment.

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://jacksth.ru/strik?utm_term=fbv+shortboard+mkii+vs+fbv+3 PDF link annotation
    • https://cdn.sqhk.co/bebumila/zjep3hg/waltz_of_the_flowers_sheet_music_clarinet.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/assam_tet_up_book.pdfIn PDF document text
    • http://autolombardpro.ru/15884974883mxkhz.pdfIn PDF document text
    • http://scotiaenlineape-personas.com/dungeons_and_dragons_basic_rules_1983fdq13.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/gbMzoJl/blue_moon_ice_cream_port_austin.pdfIn PDF document text
    • http://ag-management.space/font_awesome_cheat_sheet_4._7._0fgs7e.pdfIn PDF document text
    • https://cdn.sqhk.co/losokifape/1jfmgAF/motor_vehicle_near_me_appointment.pdfIn PDF document text
    • http://linefofaxugedu.mywebcommunity.org/xosimebivilevulomufexoriw.pdfIn PDF document text
    • http://rusagobaloregir.22web.org/fatosowuzavofufolad.pdfIn PDF document text
    • http://golivexi.22web.org/lidibalozemelexo.pdfIn PDF document text
    • http://bururofag.iblogger.org/arduino_ide_chrome_os.pdfIn PDF document text
    • http://zinalonisu.iblogger.org/limezuxokafakane.pdfIn PDF document text
    • http://requiremcgood.com/marimosudssi5.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/fejififimaketo/hong_kong_city_video_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/kovalerixupuwa.pdfIn PDF document text
    • https://s3.amazonaws.com/pulujolatepuv/ligutolixudiguve.pdfIn PDF document text
    • http://vigavanoxe.onlinewebshop.net/buyer_personas_adele_revella.pdfIn PDF document text
    • http://kifulagezi.rf.gd/the_giant_book_of_questions_and_answers.pdfIn PDF document text
    • http://datufubizut.rf.gd/lg_washer_not_draining_or_spinning.pdfIn PDF document text
    • http://kitukogoxav.epizy.com/tevidizapodixubuvafanades.pdfIn PDF document text
    • https://s3.amazonaws.com/xuvamuba/kipegipusefoluwojunibad.pdfIn PDF document text
    • https://www.andertons.co.uk/electric-guitar-amps/electric-guitar-amp-accessoriIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112BF 5496 bytes
SHA-256: 6355c30ec2837bd140ec88a10aec3a922bd02b08c459ab08d78a78ef9432133a
font_01_sfnt_off0001254e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254E 12620 bytes
SHA-256: e0fa477464e5da765786fd7549c4ec4087fa8d2c66ddff9842a7360b0e13176f

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