Malicious PDF — malware analysis report

Static analysis result for SHA-256 701ee0983474ae4a…

MALICIOUS

PDF

69.8 KB Created: 2021-02-23 21:01:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 298412634e77fc56c4fcbcd2ff785a20 SHA-1: 3114c5cf0a690f98cd113948825f4bd53d733251 SHA-256: 701ee0983474ae4ab0ffeb846c20d4148b429b0256c4e6583d3be5b8b0385dbc
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'jacksth.ru', which is likely part of a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the PDF is designed to host many links on disposable domains, further supporting a malicious purpose. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/wb?keyword=formula%20para%20sacar%20volumen%20de%20prisma%20rectangular PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4390642/normal_5fe18a6e76037.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420449/normal_6033bfe1ad8e5.pdfIn PDF document text
    • http://yoga-fitness.space/go_tell_it_on_the_mountain_zach_williamsugk2f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466175/normal_5ff281b68f0e0.pdfIn PDF document text
    • http://lotto-investclub.com/2195592331eri8n.pdfIn PDF document text
    • http://monstergym.ru/63765871216u8w0c.pdfIn PDF document text
    • http://natlegend.space/download_m64plus_fz_pro_emulator_apk28eh4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370768/normal_601f42c24858c.pdfIn PDF document text
    • http://martans.space/kodabaruduragemewenoxuzijphhqj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444646/normal_5ffcf82806f82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478923/normal_6012bb6d9adaa.pdfIn PDF document text
    • http://akillidestekbasvuruformu.online/89981379525w2f92.pdfIn PDF document text
    • http://tiktokhd.design/sidovuvif7b387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369311/normal_601381e7d6155.pdfIn PDF document text
    • http://drenajkrasnodar.ru/battleground_advanced_graphic_tool_bagtohiop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373776/normal_5fdad439a4e7b.pdfIn PDF document text
    • http://shoop-fr.ru/11045531419t1h9r.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/fowikorejodi/xusegumimoretitopo.pdfIn PDF document text
    • https://s3.amazonaws.com/runuzitexokol/can_t_believe_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/dial_of_the_old_ones_puzzle_answer.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_off0000d049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD049 5408 bytes
SHA-256: 9439e59e23f6f8f61a6081c025ea6a582398e5df36015ad0e53091a6410f6f7a
font_01_sfnt_off0000e2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A4 11560 bytes
SHA-256: b939e1c7b532f50b0e509cc8a291dd932189d69ba968752d20dc9b0f7fa5adb9

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