Malicious PDF — malware analysis report

Static analysis result for SHA-256 969b4aaf02a2d22e…

MALICIOUS

PDF

88.5 KB Created: 2021-04-20 16:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ed7fdbb7617ebbc3744401968dd935a4 SHA-1: 5fb1dfb9ae8433b40467737344e04980e5754b16 SHA-256: 969b4aaf02a2d22e4b5385a5ba0c17a6cd5a6408c983f5af2993e760a5f5f4e5
166 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://vilenefex.ru/strik?utm_term=uniden+bct8+manual PDF link annotation
    • http://kudikadip.getenjoyment.net/tibovuwowemejirejefikara.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/wanaxowuwot/fidimb8/xuwojupinejefi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443617/normal_604eeda615b4e.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/SY1hLQJ/pay_express_bill.pdfIn PDF document text
    • http://fanutoragozogow.sportsontheweb.net/boluloravus.pdfIn PDF document text
    • http://xijonofupawulo.mypressonline.com/marvel_comics_reddit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470968/normal_601a7fbb9108c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489033/normal_600f7d2885b8a.pdfIn PDF document text
    • https://cdn.sqhk.co/belesobikezi/Tgcjggc/sudoku_evil_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/zoxinugokas/DidnSje/puvutidewesiwoke.pdfIn PDF document text
    • http://nanebaxexob.getenjoyment.net/bc_children_s_hospital_map.pdfIn PDF document text
    • http://zibikudupe.mywebcommunity.org/albert_camus_francais.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/bihar_police_constable_bharti_2020.pdfIn PDF document text
    • http://kikababono.mywebcommunity.org/48857764729.pdfIn PDF document text
    • http://pifemukopisare.sportsontheweb.net/how_to_put_a_samsung_refrigerator_into_forced_defrost.pdfIn PDF document text
    • http://pumaguli.scienceontheweb.net/71614465606.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/tidigudetefumof/7642250281.pdfIn macro / runtime command snippet
    • http://xepatodop.onlinewebshop.net/candidate_experience_survey.pdfIn PDF document text
    • https://s3.amazonaws.com/zesixefe/android_games_with_best_graphics_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/fantastic_beasts_and_where_to_find_them_2_book.pdfIn PDF document text
    • http://lopakesuzuw.atwebpages.com/viwarodoxovapitegi.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_off00011c83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C83 5136 bytes
SHA-256: 813843d554eb886e87b9a0565efab1076e3069e4664cf948257bc83835ca0c71
font_01_sfnt_off00012de7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DE7 11372 bytes
SHA-256: d2a6f5814d55144d515b9b5c44e2255ab4e026bfd4896a397650588b5165e883

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