Malicious PDF — malware analysis report

Static analysis result for SHA-256 f01c91e0cdef4182…

MALICIOUS

PDF

80.9 KB Created: 2021-04-30 08:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 3eafc62f94e4d7c63ac871cbc82093ec SHA-1: 21bae93e8092072b1917ab40d7f05a9a00fda770 SHA-256: f01c91e0cdef41820e19b4e0b40a951455ebe4a70b32dd6a36470e0a58b68f9c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous embedded URLs, with a significant heuristic indicating it functions as a link farm hosted on disposable domains. One prominent URL, https://jacksth.ru/strik?utm_term=entwined+in+you+quotes, is likely the primary lure, potentially leading to phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=entwined+in+you+quotes PDF link annotation
    • http://poguvezi.22web.org/7974177566.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/WbheieA/39959386315.pdfIn PDF document text
    • http://gopururin.iblogger.org/fowesusevipavekikibe.pdfIn PDF document text
    • http://zoxuruje.sportsontheweb.net/boxuwudopurubiku.pdfIn PDF document text
    • http://durowan.sportsontheweb.net/brand_awareness_theory.pdfIn PDF document text
    • http://peluxuba.sportsontheweb.net/toshiba_32c110u_stand_screws.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupasuzoku/aijuTjb/shattered_pixel_dungeon_guide_honeypot.pdfIn PDF document text
    • https://cdn.sqhk.co/vadezewe/gdUikie/minecraft_pe_mods_for_free_on_ipad.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefima/icnNNjh/nesuno.pdfIn PDF document text
    • https://cdn.sqhk.co/lamajemomu/ieiiAnE/after_worlds_collide_trailer.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/tinajabizoreguf/42328610914.pdfIn PDF document text
    • https://7c3dd69e-6649-485e-b385-36acc2971cd6.filesusr.com/ugd/cf9ff1_f56e9ff497674aa6b9ff5ae575d0f11b.pdf?index=trueIn PDF document text
    • http://jotigosi.epizy.com/pebadugi.pdfIn PDF document text
    • http://koradanizepagow.myartsonline.com/autocad_architecture_3d_tutorial.pdfIn PDF document text
    • http://kajuxaru.rf.gd/jawbone_up24_application.pdfIn PDF document text
    • https://s3.amazonaws.com/sinadi/92039498075.pdfIn PDF document text
    • https://1d812fcc-cfc3-4558-a870-56fc5b7f4c2e.filesusr.com/ugd/754d94_f0bb069309524612bdfc3952d85e6154.pdf?index=trueIn PDF document text
    • http://lurolubudoruk.onlinewebshop.net/broiler_production_business_plan.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_off0001020c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020C 4756 bytes
SHA-256: 7235a90a0b52758301bd6e0686d0782b3bb1595b77180e5d8f00172a3cc857cc
font_01_sfnt_off00011269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11269 10788 bytes
SHA-256: 927432fb8a4e027ec6f2126b1faa62ee8f4fb7eeb06e35af95925200d56724cf

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