Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cf047eb32264528…

MALICIOUS

PDF

92.0 KB Created: 2021-02-21 11:36:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 1d62da95f1a3c5b4f1d94b8532c9518f SHA-1: 2a94735f975b5c883b5d2d52f55f0a9a6d53e716 SHA-256: 5cf047eb32264528eca24faeb6bb2fa7c042a8864a3a4264498a02e72c9df477
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains multiple external URLs, with a prominent one suggesting a software download lure. The presence of embedded URLs and the nature of the heuristics (link farm, disposable hosting) strongly suggest a phishing attempt designed to redirect users to malicious content.

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://seumenha.ru/strik?utm_term=atem+software+control+download+for+mac PDF link annotation
    • http://istra-backwater.ru/73347067629vcms5.pdfIn PDF document text
    • http://strgb2.ru/barfi_movie_video_songs_pagalworld5uwee.pdfIn PDF document text
    • http://cabinetsapp.xyz/adobe_colour_profiles5ffzs.pdfIn PDF document text
    • https://cdn.sqhk.co/jivumigen/gjjeyDu/sazubigetokem.pdfIn PDF document text
    • http://prodson.space/pufavebomunaz7g1z8.pdfIn PDF document text
    • https://cdn.sqhk.co/desiruzag/geiPjji/8407052362.pdfIn PDF document text
    • https://cdn.sqhk.co/jomonufo/hdgfcjb/xenoblade_chronicles_2_chapters_length.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/rhg5sjj/rank_of_a_matrix_eigenvalues_and_eigenvectors.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://filexumif.epizy.com/breather_colour_in_transformer.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/83940522879.pdfIn PDF document text
    • http://kifarir.rf.gd/acura_tlx_2015_manual.pdfIn PDF document text
    • http://dosunadis.epizy.com/kebowagenu.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/messenger_lite_uptodown_android.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/montserrat_extra_bold_free_font.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_off0001033b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033B 10736 bytes
SHA-256: 8c7ed41688a2b960820ff4b7aec6a2909cbbd87237d55edcbfb97193ffea6b88
font_01_sfnt_off00012692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12692 5248 bytes
SHA-256: 53041fe353dcb1a11fcf6cb23d6257831d5b7b2a709270d0c7398c8f56aa51d7
font_02_sfnt_off00013866.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13866 11844 bytes
SHA-256: 7dead6d9dda5bac6f39a47e3d165476b0b0cb99ad51d0493e2fe0c09e991bff3

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