Malicious PDF — malware analysis report

Static analysis result for SHA-256 39eeef752686e8dc…

MALICIOUS

PDF

77.5 KB Created: 2021-02-28 19:21:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 353673499c9da609b51508a8dbcbb61f SHA-1: 3e8023c7d106cc63b10a56a95c42c94d9bd04f6a SHA-256: 39eeef752686e8dc1a1756ee1e59f86faf1eefcbf6f63a8f9f4d0ddc0e63d43f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://lozipotod.ru/strik?utm_term=ibm+thread+dump+analyzer PDF link annotation
    • https://cdn.sqhk.co/luwokiseg/fjcuhdq/wutusagotesu.pdfIn PDF document text
    • https://cdn.sqhk.co/gikasiful/jhXhgqd/medubosuzetiranemi.pdfIn PDF document text
    • https://cdn.sqhk.co/navozaxezini/hzYgcgd/17732022105.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/emerson_thermostat_1f80-04.pdfIn PDF document text
    • https://cdn.sqhk.co/zopimoforaja/di27JYY/project_manager_remote_jobs_uk.pdfIn PDF document text
    • http://nogurufegu.mygamesonline.org/todose.pdfIn PDF document text
    • http://sagedix.medianewsonline.com/9008685553.pdfIn PDF document text
    • http://bizbize-yeteriz.org/36279912846ycskp.pdfIn PDF document text
    • https://cdn.sqhk.co/rotuzuwibi/wYXhihf/cat_evolution_clicker_tapps_games.pdfIn PDF document text
    • https://cdn.sqhk.co/rowazazapa/d8jaXD3/frozen_crushed_garlic.pdfIn PDF document text
    • http://ogranicbio.space/all_the_bright_places_book_pricebsczo.pdfIn PDF document text
    • http://kifopelidito.mypressonline.com/sosatuxafavidokeli.pdfIn PDF document text
    • http://amaryllis.space/qibla_direction_compass_appqxrkt.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jezevenakos.myartsonline.com/34642089270.pdfIn PDF document text
    • http://wonanikapudidak.atwebpages.com/dijezagunon.pdfIn PDF document text
    • http://jujageritoxo.atwebpages.com/zupaxitizubufiz.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_off0000edca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 5252 bytes
SHA-256: 2d5feb87026d218b3f4c35cddb8f4765e5b73a9f3834d1809396507976d37ddd
font_01_sfnt_off0000ff7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7E 12148 bytes
SHA-256: 15f051ea94926e963f1994de352f9b7116abfe9ead112585416958e42e065df3

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