Malicious PDF — malware analysis report

Static analysis result for SHA-256 950efd622b72f184…

MALICIOUS

PDF

73.7 KB Created: 2021-02-15 03:16:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c106926210f3de01df4c6851f84685da SHA-1: cee99cf8a954664e71f48b38746abc76db2cf1c6 SHA-256: 950efd622b72f184a865012955f397caaf625cc922d3fd8a9d17d8a06f71ae20
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though heavily obfuscated, contains keywords like 'calendar' and 'income_statement_template' which align with the heuristic findings of a link farm designed to lure users to potentially harmful sites.

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://maypoin.ru/wix?keyword=wfisd+calendar+2020-21 PDF link annotation
    • http://circus.market/income_statement_template_nz9qoyi.pdfIn PDF document text
    • http://tiktokfrance.fun/factoring_quadratics_puzzle_worksheeth6ugd.pdfIn PDF document text
    • http://grinallex.shop/download_game_parkour_flight_mod_apk0xhya.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/Ojiidgh/crazy_driver_taxi_duty_3d_mod_apk_revdl.pdfIn PDF document text
    • http://organicsss.space/fugaduclo5g.pdfIn PDF document text
    • http://4escam-bot.online/nacha_addenda_record_formatczmpt.pdfIn PDF document text
    • https://rudagaje.weebly.com/uploads/1/3/4/3/134310377/88fd57cae57.pdfIn PDF document text
    • https://xeludelibiw.weebly.com/uploads/1/3/4/3/134371965/metesilovul.pdfIn PDF document text
    • http://urott-hu.com/diwapovadomejinigilikobgtr6x.pdfIn PDF document text
    • https://buzapakamewogu.weebly.com/uploads/1/3/4/3/134366326/zafemokorezi.pdfIn PDF document text
    • http://poradoit1.site/numerical_analysis_questions_and_answersz1vca.pdfIn PDF document text
    • http://my-favshop.online/73980356647dmst3.pdfIn PDF document text
    • https://gaturavokig.weebly.com/uploads/1/3/4/3/134317265/c32a65f2edc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE491 5384 bytes
SHA-256: 15bce820a722a9085e3f0de577dc47ac86a1fd833a9e32238ea9982ad17c61dd
font_01_sfnt_off0000f70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70D 10380 bytes
SHA-256: 48ba6d94773e9f12ee502216ea67d2413d5ee3c539a8429ef77aafc809d44351

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