Malicious PDF — malware analysis report

Static analysis result for SHA-256 810fd59ced1bf4e6…

MALICIOUS

PDF

64.6 KB Created: 2021-02-17 14:43:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b211be31be7f51241952ab034894b328 SHA-1: 7f7e146f6ef6bce05c1949827cf8fcf0f59b7f6b SHA-256: 810fd59ced1bf4e68ead7126aa66a506b6bde2125dde6a0c319423066ba4ef09
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains keywords related to the embedded URLs, reinforcing the lure.

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://jottigo.ru/wix?keyword=jamaica+inn+aqa+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452595/normal_5fd0802f5333d.pdfIn PDF document text
    • http://topmassage.net/microsoft_s_free_monthly_budget_templates1stcw.pdfIn PDF document text
    • http://yblda.fun/k_g_f_ringtone_kannada9ox8x.pdfIn PDF document text
    • http://smcjd.com/jimuzaraxarisenokemedupuk2heu.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/isiihce/fall_guys_royale_3d_ultimate_knockout_guides.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4505820/normal_600193999836a.pdfIn PDF document text
    • http://tumexade.22web.org/34933718001.pdfIn PDF document text
    • http://mxbur.fun/fiperagud4zcnr.pdfIn PDF document text
    • http://larts.digital/18068994940tapkg.pdfIn PDF document text
    • http://milanomoda-italy.site/fitijivetibotaduje7mgk0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464861/normal_600dc47168efc.pdfIn PDF document text
    • http://lnstagramoriginal.com/histoire_de_la_republique_democratique_du_congorglip.pdfIn PDF document text
    • http://clyb-wylcan3.space/starz_comedy_west_schedulesl0fl.pdfIn PDF document text
    • http://mosquito.codes/ls_vtec_conversion_guide1reg3.pdfIn PDF document text
    • http://nalatakojuzali.iblogger.org/xorabavivuwexazafapopov.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rakutekapo.epizy.com/51144054408.pdfIn PDF document text
    • http://joriboka.epizy.com/tanesavuwi.pdfIn PDF document text
    • http://zasegusof.epizy.com/bozujeru.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_off0000c290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC290 5108 bytes
SHA-256: 2b23259a7fb560e8f6d95cfaecf218aae088f712467a00e418801345843d87a6
font_01_sfnt_off0000d3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EC 9804 bytes
SHA-256: a9dd5c268499b6defbbc32f07898eec1dda6eeed35037a355457e9c92fa277a6

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