Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7cef6901407534e…

MALICIOUS

PDF

72.4 KB Created: 2021-03-11 03:44:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d142235d015a792adc8c9185e08d3ae7 SHA-1: e873f441964c8fbe341cdf3d7f918bb76bd7814b SHA-256: f7cef6901407534e5c5cf8cce787e8d90e8b3ff5c167b81f457b1530fbfd6fe0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a primary one pointing to 'botokaw.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a date, indicating it was likely generated programmatically to appear as a legitimate document, such as a PDF about Karl Marx, to trick users into clicking the malicious links.

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://botokaw.ru/award?keyword=karl+marx+18th+brumaire+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413701/normal_5fea43219eb07.pdfIn PDF document text
    • http://newberginvestmentproperty.com/how_to_disassemble_hp_pavilion_g7i2qg1.pdfIn PDF document text
    • https://bozelisu.weebly.com/uploads/1/3/2/6/132695328/padivosaxiwaja.pdfIn PDF document text
    • http://gufutaca6.xyz/why_have_stock_markets_crash_today7v69j.pdfIn PDF document text
    • https://nametipij.weebly.com/uploads/1/3/1/1/131164318/6413828.pdfIn PDF document text
    • http://arenaprobet.com/sufepaxadedubilunfdl1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410199/normal_601cc16e3f44a.pdfIn PDF document text
    • http://galabogenezoso.getenjoyment.net/wugasujowivodexevifu.pdfIn PDF document text
    • http://goproits.com/spoken_english_notes6bkc0.pdfIn PDF document text
    • https://gonewama.weebly.com/uploads/1/3/4/0/134095907/3210093.pdfIn PDF document text
    • https://detitominaxa.weebly.com/uploads/1/3/5/3/135304018/kedelemop.pdfIn PDF document text
    • https://bufogepuvuzi.weebly.com/uploads/1/3/1/3/131381066/cd9f9bd7e24.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/44734972872.pdfIn PDF document text
    • http://lnstagramoriginal.com/12_days_of_christmas_mary_kaygizm4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2db7b228-a00e-404b-939d-94d71aeb7f49/19726972367.pdfIn PDF document text
    • http://xuvekixofeku.onlinewebshop.net/how_to_buy_original_warcraft_3.pdfIn PDF document text
    • http://lewinozed.atwebpages.com/32817380187.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfb2a512-4610-49e6-8fb8-201e8f950f1f/92338434197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/084dbb87-6a6b-4da3-8f2d-5ec4c146c3c3/throne_of_glass_book_1_ending.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_off0000dfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB0 5528 bytes
SHA-256: d7f108fc599528b1c0783b7c38040e44037a11276a50b6fc6921188c3b381f03
font_01_sfnt_off0000f258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF258 9964 bytes
SHA-256: 3cd7aa15653e6e946e7400dcbe3369337f21022f9d70bbd572a1100a38da89c5

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