Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b6011299887942…

MALICIOUS

PDF

75.8 KB Created: 2021-01-26 14:36:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7dc9a80389f3e5bb881410c1327ee7b3 SHA-1: 7a066e7d6259cc356534a801866b71160fc5f792 SHA-256: 98b601129988794276e80ec914879f0895424e18b8c1c25366e8cc2ed84e0373
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The embedded JavaScript and numerous external URIs, many hosted on disposable domains, suggest an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to 'wkhtmltopdf' and a social psychology PDF, indicating a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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/123?utm_term=think+social+psychology+pdf PDF link annotation
    • https://cdn.sqhk.co/vakanaju/AEBNhcW/royale_battle_survivor_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/vekuperik/jUiaXjh/dilowijodoluwunavivi.pdfIn PDF document text
    • http://euroshopmn.space/zagezavutikiligbg4vw.pdfIn PDF document text
    • http://bufo.online/carnival_shooting_gallery_planspy36s.pdfIn PDF document text
    • https://cdn.sqhk.co/guzamuvi/iaifVie/tiles_hop_forever_dancing_ball_hack_apk.pdfIn PDF document text
    • http://xitigedomure.66ghz.com/novexikalawirejak.pdfIn PDF document text
    • http://bigtittybella.com/street_racing_hd_mod_apk_hack_downloadiy2nc.pdfIn PDF document text
    • https://cdn.sqhk.co/jekuzedu/eiihg1E/51231723800.pdfIn PDF document text
    • http://com-signto5.xyz/skylanders_academy_season_3_episode_139yc4d.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/jiidDjd/24070918894.pdfIn PDF document text
    • http://albl.ru/jovofogesifuwapogaxgy2jb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_600fa0d2a8434.pdfIn PDF document text
    • https://cdn.sqhk.co/surodamiz/daiifCa/dog_balls_amazon.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://levewome.epizy.com/47040100557.pdfIn PDF document text
    • http://wevikokuzufos.epizy.com/xiriwol.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4E 5024 bytes
SHA-256: 5fe4886c4dfb5ee7f1d260efbc0157345e9881770c8e9666931ab582cc61d820
font_01_sfnt_off0000f050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF050 10552 bytes
SHA-256: f4af8ac48411a4176e3ccf6b0dbe80add2327c46c684a390da9523a8d16b8b6b
font_02_sfnt_off00011415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11415 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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