Malicious PDF — malware analysis report

Static analysis result for SHA-256 4499a3cf83922596…

MALICIOUS

PDF

72.5 KB Created: 2021-03-05 12:43:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 3f442848c8ed8b647347cefe92297823 SHA-1: 738533b4af47c82b230affb5c244908ab70b6579 SHA-256: 4499a3cf83922596a5cdd5172a5325671be6171ae12409494d801bd8a8724a52
186 Risk Score

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://zajinet.ru/award?keyword=tissot+t+touch+expert+battery+replacement PDF link annotation
    • https://cdn.sqhk.co/kujaruwajovi/iaQJ7hg/spanish_civil_war_1936_free_encyclopedia.pdfIn PDF document text
    • https://cdn.sqhk.co/kakapoxavu/ijMTgiG/alien_shooter_game_download.pdfIn PDF document text
    • http://xeeewq.xyz/74889250667cqlp0.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/qKhbign/texas_campgrounds_club.pdfIn PDF document text
    • https://cdn.sqhk.co/tumexifukevu/idgcgi3/monster_truck_show_medford_oregon.pdfIn PDF document text
    • https://cdn.sqhk.co/tatogevi/QqSJ7hf/twisters_ice_cream_menu.pdfIn PDF document text
    • https://fegowudabe.weebly.com/uploads/1/3/1/4/131438077/1970827.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/PX9hfGM/shark_ion_f80_multiflex_black_friday.pdfIn PDF document text
    • https://cdn.sqhk.co/mezugifosa/hhdcoib/cake_recipe_without_baking_powder_uk.pdfIn PDF document text
    • https://rebanurox.weebly.com/uploads/1/3/4/4/134490941/pojarupafobiri_fuvavapivo_xavat_dizubalubopim.pdfIn PDF document text
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/tejudozopusop.pdfIn PDF document text
    • https://cdn.sqhk.co/wupifufexix/ijfTTGz/30343706143.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/iqgjvja/puxepuzoj.pdfIn PDF document text
    • http://ryduslim.website/victoria_secret_show_performers_2016uxfet.pdfIn PDF document text
    • https://cdn.sqhk.co/mizogujuzo/iihhi0t/xewukebebizanurobidaj.pdfIn PDF document text
    • https://cdn.sqhk.co/kiribikiv/wifgckE/tabenizotefogi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_18f6060519464e8bb0d4ae0197bde082.pdf?index=trueIn PDF document text
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_d0dd995abc4c4486849f7668ca648ab9.pdf?index=trueIn 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_off0000dfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE1 5432 bytes
SHA-256: 90b268402279aa92f527b41b3e66782fdb1a34114423bce327161fdea519b2e1
font_01_sfnt_off0000f23b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23B 10164 bytes
SHA-256: 0ea43e279b8dd9e325734fa1ea4a2c073357eec33f77a7b30ef55fdfcb044e3f

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