Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5da541f3cf9b043…

MALICIOUS

PDF

81.9 KB Created: 2021-04-15 06:06:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8b24652051ef2a4bac3429b58a890c59 SHA-1: 21f0b9c585d0e40dac6ff11fcf1940f5718c56ed SHA-256: a5da541f3cf9b043f63a6baaf7cd32c8c8aca3d2fbc5ff331a365a26d5e3beac
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous links to disposable domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to a definition search, directing users to a suspicious URL.

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://jumiwimov.ru/strik?utm_term=what+do+the+word+dappled+mean PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4479226/normal_60413675c3491.pdfIn PDF document text
    • http://sutivetowit.mypressonline.com/apprendre_l_arabe_gratuit.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/hhxgfl7/tafudix.pdfIn PDF document text
    • https://cdn.sqhk.co/vimexuda/uibFdjj/chinese_checkers_play_against_computer.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467926/normal_601b47dc69725.pdfIn PDF document text
    • http://lojuxaga.mywebcommunity.org/kotinanaworep.pdfIn PDF document text
    • http://xamawigokoke.mygamesonline.org/xasetugowetokaduxalobafe.pdfIn PDF document text
    • http://dofujifeluradep.medianewsonline.com/45929444417.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469119/normal_605ee83e74212.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/Mihy48d/sword_art_online_season_1_episode_9_facebook.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369164/normal_5ffb206ead79e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422382/normal_5fc5d28e1c1f8.pdfIn PDF document text
    • https://cdn.sqhk.co/gufemazibafi/ihgjage/roblox_studio_chromebook_extension.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375704/normal_6003f9e6f2cf7.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/SjeX4lJ/wow_classic_warrior_tank_bis_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390385/normal_60184d9b411a4.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/lopadivupudexa/75379949605.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/92997502470.pdfIn PDF document text
    • http://marurutefa.atwebpages.com/46123962051.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/46785532256.pdfIn PDF document text
    • http://bamonoxo.onlinewebshop.net/ruxodagafixemad.pdfIn PDF document text
    • http://dijipola.onlinewebshop.net/sekezosetim.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_off00010323.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10323 5128 bytes
SHA-256: a6618b3d508f09000b42ce111b4d4ac5ff0cf5f1caababff97c4aefa4c1f1eba
font_01_sfnt_off0001147e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147E 11084 bytes
SHA-256: a7f9e0cc2583cda2c5b9084751ee534f066d3fb1962c6f8d197f5e7c2b312c0d

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