Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f13b3b3432c4483…

MALICIOUS

PDF

94.9 KB Created: 2021-04-16 14:22:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 467539302599341ec530162c2af2a47f SHA-1: 7c3b4b3173379f562b0fc0bf0571ac6f656ea5a9 SHA-256: 4f13b3b3432c4483c997a8cf065e4d30081b0baded8e91a21ad72a712741bc54
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains keywords related to stock trading, which is likely a lure to entice users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mezovuduw.ru/strik?utm_term=how+to+do+stock+trading+in+india PDF link annotation
    • http://sijubuwejipamun.mywebcommunity.org/bizapumozuxuxodagixe.pdfIn PDF document text
    • http://piwulag.sportsontheweb.net/gukitakumujuxosin.pdfIn PDF document text
    • http://zijofazasogija.getenjoyment.net/fubatisuxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391621/normal_6066316d97621.pdfIn PDF document text
    • http://kapovulup.mywebcommunity.org/drawing_and_painting_for_beginners.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446774/normal_5fdb007c561ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466391/normal_605b61c5142c9.pdfIn PDF document text
    • http://memiwuv.mygamesonline.org/midas_m32_manual_espaol.pdfIn PDF document text
    • http://janorewaxeno.mygamesonline.org/bonding_and_antibonding_molecular_orbitals.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404297/normal_6056f01d80df0.pdfIn PDF document text
    • http://tibudirowe.mygamesonline.org/aussie_slang_quiz.pdfIn PDF document text
    • http://dewodalaluw.mygamesonline.org/lugopezor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448746/normal_6043320fe91f8.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/retobifulipo/stress_concentration_factor_welded_joints.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba306b1a-fe04-42cc-94e1-81ee785f20a0/741709074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91babc50-283c-453f-9152-da31e19952b2/modernist_cuisine_the_art_and_science_of_cooking_review.pdfIn PDF document text
    • https://66166ed5-207d-48ad-a5ac-83b7e977862f.filesusr.com/ugd/0d0d42_91e2a536b4b64545bba4375931552c60.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevelel/outlook_email_template_location.pdfIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_06b68e39c62146f59b39739f8f9683dd.pdf?index=trueIn PDF document text
    • http://zitasixan.atwebpages.com/database_security_tools.pdfIn PDF document text
    • https://s3.amazonaws.com/wovisak/marox.pdfIn PDF document text
    • https://041c2bdd-267b-4995-9d72-d071cf2c2b2b.filesusr.com/ugd/ba0b69_0634515a8ca6451c9451ae1c938a1a5e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/geradi/what_is_the_rarest_chromosomal_disorder.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/bhagavad_gita_in_marathi_audio_free.pdfIn PDF document text
    • http://lipabarud.atwebpages.com/pumovukiragige.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_off000133d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133D9 5192 bytes
SHA-256: c868d55a7a683efe2e7f8ab587b690344af46d7c73187754db3911617127758b
font_01_sfnt_off000145a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145A6 12000 bytes
SHA-256: 769e1bc4813341fef98654bf7fd63fea4946d9d606bda2a835c88caf6d01a748