Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1f272841031847…

MALICIOUS

PDF

81.0 KB Created: 2021-03-16 02:00:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 14fb342f113bc2e3df5c86f17c5b1400 SHA-1: bf1997fe2fc0735b614f167b493f7900b2079e2d SHA-256: 2b1f27284103184731a5bc614c063a0b868fba30abb057a0b6e7c57be4d2ef6f
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan. The presence of numerous external URIs, including one pointing to 'kuzutuzo.ru/wix?keyword=knights+of+pen+and+paper+cheats', suggests a lure to a malicious website. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=knights+of+pen+and+paper+cheats PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4480755/normal_5fd8b119cc4ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426263/normal_5fc6514e53ba5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409256/normal_604678b8ce3f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402519/normal_5ff0f4f2e6355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455180/normal_601d507e7da15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453764/normal_604fe52e91e95.pdfIn PDF document text
    • http://wopudidadufi.22web.org/bewadopu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410000/normal_60003720c915d.pdfIn PDF document text
    • http://tofabukusakuni.22web.org/free_arabic_number_fonts.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://2791e1c6-719d-47aa-bdc5-1556df251b63.filesusr.com/ugd/7757c5_3a379bdf65004b52b8d76b8dda1e71a4.pdf?index=trueIn PDF document text
    • http://jukiwifid.rf.gd/biogas_production_from_organic_waste.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/76568202443.pdfIn PDF document text
    • https://081e7fb2-604d-424b-9b75-a58d54a71a44.filesusr.com/ugd/abd6ea_8653757878a24f839fd1c06ffff1e858.pdf?index=trueIn PDF document text
    • http://luxotenudiwuzu.rf.gd/31894494437.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/89314365845.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d3207b0-dde2-4c7d-889c-a39aa63d4de4/29035004393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d05cbcc-730f-460c-9195-5222d86d714c/what_is_the_measure_of_a_great_man_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe1995b7-adbf-431a-9c48-d4ddf34a6eb6/81835826695.pdfIn PDF document text
    • https://850a36a1-966c-46c3-86ed-e15bcb5778a7.filesusr.com/ugd/ede58b_cdd3c003299f4aa5831a1e9524424cb5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tafogusegabomu/how_to_change_typewriter_ribbon_underwood.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f101.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF101 5140 bytes
SHA-256: fa048b1786fd6150362f9f02ea2dff624758814942b8558dececf01beb38b369
font_01_sfnt_off00010279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10279 11232 bytes
SHA-256: 0e433b1e4613dd5aed5dee719e2a70b16c5f83bee4c7ca83ab7c8485920912ea
font_02_sfnt_off000128b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B5 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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