Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f0c25f04d4af2a…

MALICIOUS

PDF

84.6 KB Created: 2021-03-01 07:47:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 923006758edf8503f0d49d309a6dea8b SHA-1: ea5c7418844010615656a829b6f64221377b3de8 SHA-256: d7f0c25f04d4af2af8c1c5606eabcafe39b31f80a33d313b371a07676cbe14e8
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 malware distribution intent. It contains numerous external URLs, with one specifically pointing to 'kuzutuzo.ru', suggesting a link farm or redirection mechanism. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic further support the conclusion that this document is designed to direct users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://kuzutuzo.ru/wb?keyword=alpine%20ktp-445u%20problems PDF link annotation
    • http://vashmaster.info/safe_sleep_assessment_tooljkyqk.pdfIn PDF document text
    • http://cabinetshq.xyz/losixhkz90.pdfIn PDF document text
    • http://micrometerdigital.xyz/jaripatejuvuruzuwoeme2k.pdfIn PDF document text
    • https://cdn.sqhk.co/bifugudawesu/dgejhbP/free_resume_templates_2019.pdfIn PDF document text
    • http://experiment.website/cheats_de_doom_2_gba57jma.pdfIn PDF document text
    • https://cdn.sqhk.co/rizanatu/pjdhcxK/xoxon.pdfIn PDF document text
    • http://d2-club.ru/vonunudokumuwdjr6w.pdfIn PDF document text
    • http://getplafond.xyz/59463935345kreh1.pdfIn PDF document text
    • http://instasurprise.online/47132184995m6xzi.pdfIn PDF document text
    • http://dkmz3.club/mimuwopaditogodigupogoeig53.pdfIn PDF document text
    • http://sunmarkt.ru/tewoxogebimusopomexamujiig8rd.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/hiegjMa/mowebexosunibuve.pdfIn PDF document text
    • http://mir23.xyz/pozigezixotiporenig7ist.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/lulelepese/34000771444.pdfIn PDF document text
    • https://s3.amazonaws.com/rovikibixu/85445818784.pdfIn PDF document text
    • http://jawikiluzejibe.epizy.com/handwriting_sheets_cursive_tes.pdfIn PDF document text
    • https://s3.amazonaws.com/sitozi/email_template_responsive_font_size.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_off00010a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A61 5192 bytes
SHA-256: fe54d1478011f7aee4af37a55758c38a3bc536acd85a1970629f845565f6b068
font_01_sfnt_off00011c0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0B 11716 bytes
SHA-256: 17a4980ad8a4c5c91c84e5a1b5ebf763a000cc2f8b024875502dfa0b6ff2dc44

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