Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb6dd340f07e3570…

MALICIOUS

PDF

75.7 KB Created: 2021-02-28 16:14:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 38bbf142ceb5aa8af29f7ff5d707830f SHA-1: 79c00ac4179db2231926404303a565f5e6e1c35c SHA-256: cb6dd340f07e3570387841dbf559d65648a51605662826e23b685329876dd778
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, appears to be a lure disguised as a manual, further supporting the phishing attack pattern.

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://druttle.ru/strik?utm_term=ge+profile+microwave+over+the+range+manual PDF link annotation
    • https://cdn.sqhk.co/gabunufu/OUjjAhd/truth_or_dare_trailer_2012.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/AfcoieE/78062734498.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403271/normal_5ff4f89d5818e.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/special_air_service_training.pdfIn PDF document text
    • https://cdn.sqhk.co/duzemata/if0hbjc/the_child_of_slendrina_apk_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/vetedaxuzele/fRdjjih/469007451.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379987/normal_60183e74356f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379046/normal_601bb6faf3f57.pdfIn PDF document text
    • https://cdn.sqhk.co/texojijoraso/ijhgZPB/74179185723.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxisilogok/Qfhgchh/raxogepunibumib.pdfIn PDF document text
    • http://rabevazilogu.iblogger.org/how_to_bypass_fireplace_remote.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/how_to_calculate_man_days_worked_in_a_year.pdfIn PDF document text
    • https://cdn.sqhk.co/wojipezusax/gcJjiie/wind_data_heron_island.pdfIn PDF document text
    • http://vuzuwul.getenjoyment.net/is_dbt_therapy_effective_for_ptsd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wabalegawamiraj.rf.gd/63122274050.pdfIn PDF document text
    • http://felawikemuda.epizy.com/36756788163.pdfIn PDF document text
    • http://wovibojo.onlinewebshop.net/pipe_saddle_branch_layout.pdfIn PDF document text
    • http://tuwutexo.onlinewebshop.net/36350299407.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_off0000eb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB08 5432 bytes
SHA-256: 25a978ad9698f7d9ac9381b2c4382a5f9751780d795c362171fb595a6244d962
font_01_sfnt_off0000fd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD7A 10616 bytes
SHA-256: b112a42a36cca519a2e2cd8ab530285a12e67d318e5bb2168de74157f4b6c795

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