Malicious PDF — malware analysis report

Static analysis result for SHA-256 723b440bc0dd149e…

MALICIOUS

PDF

76.8 KB Created: 2021-02-07 16:09:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 0d3f8d37b44cb681762abf4481ba1ff0 SHA-1: c075591aa6163da59848fe006c61a978507b7843 SHA-256: 723b440bc0dd149e4f762899066772974c326c14c365bc9bc88f9388d656244f
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The document contains a large number of embedded URLs, many of which point to disposable domains and are likely used to redirect users to malicious content or download further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a link farm for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/123?utm_term=totalitarianism+case+study+stalinist+russia PDF link annotation
    • https://cdn.sqhk.co/kominepoli/oq6nOgg/sports_stickers_for_iphone.pdfIn PDF document text
    • http://idealslim-ordina.site/hydrology_book5l0u6.pdfIn PDF document text
    • https://cdn.sqhk.co/wugolekufo/ic7hjgh/pixel_block_survival_craft.pdfIn PDF document text
    • http://thedefenseforge.com/varudumogikokizolvu99i.pdfIn PDF document text
    • http://avtoshkola-region26.ru/pobasotakadu14jkb.pdfIn PDF document text
    • http://borezopesane.22web.org/53866974647.pdfIn PDF document text
    • https://cdn.sqhk.co/limiwebu/kYibMig/private_school_teacher_job_letter.pdfIn PDF document text
    • https://cdn.sqhk.co/ligumorik/JgfRicy/hocus_pocus_television_schedule_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/pJvjhAO/cake_decorating_frosting_recipe_wilton_buttercream.pdfIn PDF document text
    • http://kigurumi.org/29647683646u8tis.pdfIn PDF document text
    • https://cdn.sqhk.co/fanoxozowupe/hij3jdR/let_me_draw_nearer_lyrics_and_chords.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxawexa/9JKTifT/96989486637.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/IJhiZge/44437991383.pdfIn PDF document text
    • http://shoop-fo.ru/supreme_duelist_stickman_mod_apk_homemir4u.pdfIn PDF document text
    • http://abanca-electronica.com/67742572483xuewb.pdfIn PDF document text
    • https://cdn.sqhk.co/fifapupifig/puhgRjf/sudewejakutuwajites.pdfIn PDF document text
    • https://cdn.sqhk.co/ragojagef/cBcMgja/72480091527.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mawekipabotore.epizy.com/carrom_pool_game_hack.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B9 5136 bytes
SHA-256: 745c037805b4a905ef926a8f657cb8cc1bce3b7e7473a12813dfc3e3ec170a33
font_01_sfnt_off0001021f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021F 10580 bytes
SHA-256: 1bfa7eb65265fdb91ad67b209b66d18e774ab857411621a184edb85f4dbaf674

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