Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f72624c7be1cd6…

MALICIOUS

PDF

74.8 KB Created: 2021-03-16 11:39:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: d874d35c3c59e853de5990201b5aa0aa SHA-1: b6516df79f1f5b505efd1f094f7eb870bd2f7e1e SHA-256: 86f72624c7be1cd608fd72ee5cccb58ac926217b2a9e82268e306fc4024846b4
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, with a notable external URI pointing to 'vilenefex.ru', suggesting a phishing or malware distribution attempt. The PDF structure also indicates it's part of a link farm on disposable hosting, further supporting a malicious intent.

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://vilenefex.ru/123?utm_term=jefferson+vs+hamilton+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409103/normal_5feb3b0234871.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471240/normal_5fde90adc1e59.pdfIn PDF document text
    • http://kevogam.22web.org/bilal_saeed_new_song_2019_pagalworld.pdfIn PDF document text
    • http://nenugatigubom.66ghz.com/pupujenefalulugozaw.pdfIn PDF document text
    • http://ritemadot.22web.org/dofuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373985/normal_5fec345f4b883.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/c2790661-08a4-4a59-87fc-d779ed9d188e/flow_diagram_shapes_meaning.pdfIn PDF document text
    • http://torubawenaw.rf.gd/ribofobodubedupofobudexuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84533365-8087-4288-8462-98c665d4d2ca/how_to_adjust_casio_wave_ceptor_watch.pdfIn PDF document text
    • https://6674166f-eb58-46b1-9d38-a528bc95e02c.filesusr.com/ugd/e38d8e_1986757f2d2747299b15de25fccc44ed.pdf?index=trueIn PDF document text
    • http://majaposudirux.epizy.com/barragem_dos_pequenos_libombos.pdfIn PDF document text
    • http://limazajot.rf.gd/giant_defy_2_2013_size_guide.pdfIn PDF document text
    • http://rilusugoxis.rf.gd/attributive_clause_exercises.pdfIn PDF document text
    • http://wevakupugizewu.epizy.com/dezunujede.pdfIn PDF document text
    • https://165b0ab0-89c3-4517-b88f-e2bd0c55d975.filesusr.com/ugd/97b555_25feb0f470aa47ba9bcc3edb4a98663d.pdf?index=trueIn PDF document text
    • http://lujotuxubegu.rf.gd/hiperplasia_benigna_de_prostata_2020.pdfIn PDF document text
    • http://raxabavanuwirig.rf.gd/cardiology_free_book.pdfIn PDF document text
    • http://sobunase.epizy.com/zadilirosemos.pdfIn PDF document text
    • https://354df738-7a8c-4643-bdcd-aa58f7c4bd0c.filesusr.com/ugd/69cf62_fe083fbebddb4fff9088189f276be976.pdf?index=trueIn 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_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 5212 bytes
SHA-256: 347e7911cd7e50108469d8c3ddb87be0c282832a1bb37e332c8863b0f3b190f1
font_01_sfnt_off0000f9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EB 10652 bytes
SHA-256: 2805a843868c2f34cf9fd7f928032711e64891fd9fdb8c0780ddbc5c1e7bbce5

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