Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d15b7c9b78d508f…

MALICIOUS

PDF

87.8 KB Created: 2021-03-03 03:46:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 386ab7e495548ba8b272192f42ea98c7 SHA-1: 633ce9d741a9cdb2cab8ca6dbcd852a27f0f4de4 SHA-256: 8d15b7c9b78d508f0eb871e807bdfc39fdb695b1203b8f501f18e548f5fa66ce
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The document body, though heavily obfuscated, combined with the presence of numerous external URLs, suggests an attempt to redirect the user to malicious sites. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly indicates a social engineering tactic related to financial transactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://seumenha.ru/strik?utm_term=how+to+get+pebble+watch+faces+2019 PDF link annotation
    • http://uorott.com/11286045485xpgz2.pdfIn PDF document text
    • https://jopokiwajisi.weebly.com/uploads/1/3/4/1/134108554/kojaluregumexeg-reteraviraz-supadazojatub.pdfIn PDF document text
    • http://lnstagram-copyright-supports.com/roteiro_de_cerimonial_para_festa_de_formatura17rrd.pdfIn PDF document text
    • http://jikusofare.mywebcommunity.org/this_is_amazing_grace_by_phil_wickham_ft_lecrae.pdfIn PDF document text
    • http://gufutaca1.xyz/brookstone_alarm_clock_4511_manual4ze2z.pdfIn PDF document text
    • https://cdn.sqhk.co/kefesizo/ji1jbmM/hungry_shark_world_hack_2020_mod_apk.pdfIn PDF document text
    • http://aslixan.com/envy_4500_series_printer_driver5d6xu.pdfIn PDF document text
    • https://moxizeza.weebly.com/uploads/1/3/3/9/133999163/1ca439dc51.pdfIn PDF document text
    • http://ellmax-site.xyz/how_to_count_rests_in_music8yf2w.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jewofeket.onlinewebshop.net/wakumafusere.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/63800041370.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_off00010404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 5856 bytes
SHA-256: 61740cad49e2e07e64b06e281595b9771ebe7894a3bc0001c3789c54f8186451
font_01_sfnt_off00011808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11808 10888 bytes
SHA-256: 94f5124288e824aa582dd996417dc43257de467aebba5d035da9027901b1f2d0
font_02_sfnt_off00013d52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D52 16084 bytes
SHA-256: 54d04255b9e47da136c10f44e1ac17d43a0331c368bcbbbb9825cd1c043b4bd3

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