Malicious PDF — malware analysis report

Static analysis result for SHA-256 9512594b4fd6b995…

MALICIOUS

PDF

82.6 KB Created: 2021-03-10 23:46:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cfa2ae53ec92b96782db992c974c49bf SHA-1: df38f67da6e64b316173324d92220a892c737a33 SHA-256: 9512594b4fd6b99540860f9604df5716a938331f920b29938948c216a92a48dc
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs pointing to suspicious domains, including one that appears to be a link farm designed to host multiple PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, suggests a lure related to 'Downton Abbey episode guide series 6'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/123?utm_term=downton+abbey+episode+guide+series+6 PDF link annotation
    • http://letnesil.xyz/10438355332idwz7.pdfIn PDF document text
    • http://info-pages.ru/long_e_worksheets_printableskz5i.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479678/normal_601e2cbce87a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475570/normal_6022bb0763cb1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378393/normal_5fed93f0e88a3.pdfIn PDF document text
    • http://helplnstagramoffice.com/kekolalolidafunenisr96m.pdfIn PDF document text
    • https://cdn.sqhk.co/janonaset/ch9haca/56511999982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482218/normal_603bf89172aca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374838/normal_600de690dcf79.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/8uiaf4S/pottery_coloring_book_2019_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494166/normal_5fdd33d532971.pdfIn PDF document text
    • http://jnatural.space/581823761145wbc7.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/Pif3ig9/67444966718.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/tarizirefevifab/platform_bed_diy_kit.pdfIn PDF document text
    • https://s3.amazonaws.com/wesezuzuvalirik/crossword_answer_for_ostentatious_display.pdfIn PDF document text
    • http://vaxabusegaw.epizy.com/bibasonedopu.pdfIn PDF document text
    • http://kakapefetabol.rf.gd/ansys_spaceclaim_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/6518150286.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_off00010621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10621 5584 bytes
SHA-256: 24372dfc1c11d78f39cac3c13a67a804c079ad747ee4eb8980b56c184f628980
font_01_sfnt_off00011949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11949 10476 bytes
SHA-256: 306408a85235b47653103e895d07dc8d5d87e412bf0663c8d0c39662445b58d5

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