Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c909f1ac66b906…

MALICIOUS

PDF

77.0 KB Created: 2021-03-23 14:44:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 51024e2ac5d0ecb6971dcf1160683ad3 SHA-1: 0e56e4f8994246b01ba88febda63d77e243dc159 SHA-256: 09c909f1ac66b9062b5b235eee304963ffa0aecfef313d8bae915d4ebe222ecd
226 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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://jacksth.ru/award?keyword=administraci%25C3%25B3n+de+recursos+humanos+bohlander+pdf PDF link annotation
    • https://balikawe.weebly.com/uploads/1/3/4/6/134659528/7fa90308.pdfIn PDF document text
    • http://patusare.22web.org/89484242488.pdfIn PDF document text
    • https://cdn.sqhk.co/posebozej/Mlwjijd/lalexarunuwifi.pdfIn PDF document text
    • https://cdn.sqhk.co/wenejusuzixe/b0iagcs/gamag.pdfIn PDF document text
    • https://vobanugan.weebly.com/uploads/1/3/5/3/135340106/josazeponanogu.pdfIn PDF document text
    • https://cdn.sqhk.co/tipusuzog/JXic3Gi/transmission_fluid_pump_kit.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/hfEQaDO/22488141554.pdfIn macro / runtime command snippet
    • https://fudesatalaponu.weebly.com/uploads/1/3/2/7/132710537/fejelov.pdfIn PDF document text
    • https://cdn.sqhk.co/butemobe/iLjfria/tonujabuwefebok.pdfIn PDF document text
    • https://cdn.sqhk.co/xogixute/cieEgis/old_bumper_cars_for_sale_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/tipusuzog/JXic3GiIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/potamotaz/jolozekonuxi.pdfIn PDF document text
    • http://duxupupin.epizy.com/xewasi.pdfIn PDF document text
    • https://s3.amazonaws.com/vinejivunitego/how_to_make_naturally_curly_hair_at_home.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/96321034628.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/waxapoz/marvel_studios_movies.pdfIn PDF document text
    • http://wijinap.rf.gd/how_to_calculate_number_of_years_passed_in_excel_using_today.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/how_long_does_it_take_to_learn_final_cut_pro.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/86181537411.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/tivutawizagamerukonera.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BD 5660 bytes
SHA-256: e6bf6864c75e6f286416cf5b7924fe7e20af809ad8cd644412e3174933c405ff
font_01_sfnt_off0000e989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE989 11348 bytes
SHA-256: bf992d034670190ce8b9c9841f33ccaaa49f126f4b0d08161413e3cda4adc802
font_02_sfnt_off00010ef4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF4 16060 bytes
SHA-256: d7dbcefd5a9d087f9dbd48d87e5b82950a900fa0f666d4a1f78598b818f3f613