Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ca6207181365fa…

MALICIOUS

PDF

78.3 KB Created: 2021-03-31 17:23:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2e644054e7a79cde55451a76ab0cecd1 SHA-1: 5d408164d83cc3f5e63218b7a3ae4c87d901a1a8 SHA-256: c7ca6207181365fa5852c773ee6627b4b314fce68f7eb1eaa92f64ba4795e6f1
166 Risk Score

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 0.9992

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://xezojetit.ru/wix?keyword=zombie+apocalypse+unblocked+game PDF link annotation
    • https://cdn.sqhk.co/tunuviju/3y2hiia/ice_cream_flavors_starting_with_a.pdfIn PDF document text
    • http://lefavapexusa.iblogger.org/basetsana_kumalo_book.pdfIn PDF document text
    • https://cdn.sqhk.co/lojulifuvuxu/sjfjjjh/17960979933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370543/normal_60226c8715fbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402949/normal_5fe44f1e5565a.pdfIn PDF document text
    • https://cdn.sqhk.co/belesobikezi/Miigh30/restaurante_picaporte_bistro.pdfIn PDF document text
    • https://cdn.sqhk.co/serojimo/Iig7hie/84637232792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485569/normal_6063eb74aa140.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412900/normal_6028a3eb39ca2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458125/normal_603bb09f78768.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426701/normal_601e035c43492.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/wd_my_cloud_mirror_raid_setup.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489983/normal_600021c136220.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374704/normal_6000b5aacbc9d.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/jc2gfhb/dudopibibemutin.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481994/normal_6015cc855d89d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411220/normal_5ffc7cf046f88.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406473/normal_5fe1a218ebcdd.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/ijKjfjc/shortcut_run_as_administrator_cmd.pdfIn PDF document text
    • https://cdn.sqhk.co/xadeviro/whfgce6/dunowemukilafoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470399/normal_6054e9abbe11f.pdfIn PDF document text
    • https://cdn.sqhk.co/xadeviro/whfgce6/dunowemukilafojIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rigemileluzed.epizy.com/3715054449.pdfIn PDF document text
    • http://lewizalejeso.rf.gd/84537511878.pdfIn PDF document text
    • http://wovepelifuro.epizy.com/hp_officejet_pro_8600_not_scanning_full_page.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_off0000f27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27E 5560 bytes
SHA-256: a53b0309d16f52b813f80a75fae32003bdee158b9989a128462a4ac5ada740f3
font_01_sfnt_off00010568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10568 11276 bytes
SHA-256: 68475850d3d14e6fab1dc6be4e7744eaac446181fd50ebfb805f68be61efbb22