Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e76632db61ecd7…

MALICIOUS

PDF

75.0 KB Created: 2021-03-12 03:04:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8b86f84bb7c7d1fc32250730fc3a9d5 SHA-1: 35d1d34150f0cde0818b3185522247c0de2aeb3c SHA-256: 45e76632db61ecd7a9e10979513e9361d97a3c752f1e02d964ae29c55d1632e2
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially harmful, websites.

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://golowaki.ru/aws?utm_term=discrete+mathematical+structures+6th+ed.+%2528pearson+international+edition%2529
    • http://finuxezanasa.mygamesonline.org/how_to_tell_if_roomba_675_is_charging.pdf
    • http://topenir.iblogger.org/alita_full_movie_in_tamil.pdf
    • http://veruvipavopa.getenjoyment.net/gaxagupopuvojenimiwamok.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/rizezobabub/aha_heart_failure_guidelines_2017.pdf
    • https://ec08fec6-e576-400d-8504-372613838d3c.filesusr.com/ugd/57e0ce_b3a634263be243d8bc04f570d139710b.pdf?index=true
    • http://todizugofufufax.epizy.com/60029957121.pdf
    • http://tisilakifejil.rf.gd/vampire_diaries_season_8_episode_16_summary.pdf
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_0dcf64c45def4b34b4cdda0fa4e76aa7.pdf?index=true
    • https://0503187d-52cd-4237-9521-a3cb9bf551ae.filesusr.com/ugd/5bb01c_16289547ad4542ac8fbef8b721cf36bb.pdf?index=true
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_56a4721ee5e24f46a3354c13513c4a7a.pdf?index=true
    • https://s3.amazonaws.com/roxawo/arm_strengthening_exercises_for_seniors.pdf
    • http://mosokiwilag.rf.gd/97212484988.pdf
    • http://sisifufaz.epizy.com/14799290550.pdf
    • http://bopebewi.epizy.com/72225349582.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5dd.bin
5e95208690ca209c204b770a3671ccfdd2ce9d496c6c8a2d6b1e5ea39b5fb99c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DD 5652 bytes
font_01_sfnt_off0000f8f9.bin
ab85a13a3c0ceabd43df266ce488e90de9afbdd922f7a75392fe8134618a6437		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F9 10876 bytes

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