Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a9c202399259b3…

MALICIOUS

PDF

77.4 KB Created: 2021-02-21 21:32:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7c3cbc13d6ba2b41838783336e413861 SHA-1: d7053b8bf434f864c911345e768e6efe659f30e8 SHA-256: b8a9c202399259b3281aaf0eac58af07501e972aeefe7ccee91cd814157c462d
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains or link farms, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to trick users into visiting compromised sites.

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/wix?keyword=shooting+games+unblocked+at+school+66 PDF link annotation
    • https://cdn.sqhk.co/visobipibe/iiJ9Big/rutij.pdfIn PDF document text
    • http://datekal.22web.org/vuzag.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/jijb9P8/sales_and_marketing_skills_training.pdfIn PDF document text
    • https://cdn.sqhk.co/buwuvibija/hggjgc9/top_scorer_in_ipl_2019_list.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/ZzdYyjj/daily_challenge_card_games.pdfIn PDF document text
    • http://logvoz.ru/absolute_value_worksheets_grade_7lpd46.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/uvviexO/f1_racing_simulator_cockpit_for_sale.pdfIn PDF document text
    • http://antonio-ita.space/exercices_adjectif_possessif174g0.pdfIn PDF document text
    • https://cdn.sqhk.co/vawupemowa/XjgcC2s/46657115172.pdfIn PDF document text
    • https://cdn.sqhk.co/niserutom/Injh74g/diagscan-_car_diagnostic_elm327_obd2_codes_scanners.pdfIn PDF document text
    • http://tonagruz.ru/jejomobuzafevorugamuahmtv.pdfIn PDF document text
    • http://esplus.pro/castlevania_gba_gameslr9nr.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://givoraxanusupe.rf.gd/destruction_warlock_leveling_guide_legion.pdfIn PDF document text
    • http://kubufubudigag.epizy.com/augmented_reality_apps_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DF 5600 bytes
SHA-256: 01cfc26749c02a03890aa6c953bccc748dbdcb6e4574b8f2a121dcbd62c77e01
font_01_sfnt_off0000f7b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B2 10072 bytes
SHA-256: baa5586de1ae9fd1770e90537d37763b4acca0b2352f550dd0ac1b70e74f0fd7
font_02_sfnt_off00011a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A12 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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