Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2442ba093805bdd…

MALICIOUS

PDF

71.8 KB Created: 2021-03-23 15:25:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 15abe049e137e6650a8f316a32657c47 SHA-1: 79d19d99e9292e090a3221ff052583caafb7e9e0 SHA-256: a2442ba093805bdd3dbed114e79b62e49f7f0bd8a41804127a7f126a752c3c54
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a large number of external links, suggesting a link farm or phishing attempt. The ML classifier and ClamAV also identified it as malicious. While no scripts were directly extracted, the PDF structure and embedded URIs indicate an attempt to redirect users to potentially malicious or SEO-spamming websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/wix?keyword=conservation+of+mass+lab+answer+key
    • https://vowebaxuzifov.weebly.com/uploads/1/3/0/7/130738870/xukarisaru.pdf
    • https://cdn.sqhk.co/bigulikexupa/fPiig9B/hop_step_basketball_drills.pdf
    • http://pokezokebawi.mygamesonline.org/88779443163.pdf
    • https://cdn.sqhk.co/woselukafo/HhcWQgj/91282587329.pdf
    • https://cdn.sqhk.co/fovipobex/gjeFgfr/durarawirisebi.pdf
    • http://miwasigal.mywebcommunity.org/learn_python_in_one_day_and_learn_it_well_workbook.pdf
    • http://gepavozo.mygamesonline.org/22310050586.pdf
    • https://mefutugotipefij.weebly.com/uploads/1/3/5/3/135304762/b4815f.pdf
    • https://garizoruzaxa.weebly.com/uploads/1/3/3/9/133986237/jevuzo-mizemax.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jimomurapujivo.onlinewebshop.net/kewuzuna.pdf
    • http://waxaravibew.epizy.com/brothers_of_peace_albums.pdf
    • http://kukadafimi.rf.gd/23292856545.pdf
    • https://uploads.strikinglycdn.com/files/9202a0b6-507e-48f6-b595-f25dd3375170/why_is_my_keurig_just_dripping_coffee.pdf
    • https://uploads.strikinglycdn.com/files/423fd999-3bc1-44db-bf35-26a923ae635c/cba_mail_anywhere.pdf
    • http://sazasewugekupej.onlinewebshop.net/98078417529.pdf
    • https://uploads.strikinglycdn.com/files/37fb3173-00a9-43ce-a09e-d267332d8081/how_do_i_take_my_ged_test_during_covid_19.pdf
    • https://uploads.strikinglycdn.com/files/a922ab5c-5bb2-4168-b1d6-a7aae7b3d2cf/can_i_replace_wired_smoke_detector_with_battery.pdf
    • https://uploads.strikinglycdn.com/files/0ac817af-971e-4197-b495-d3d27f5a8bd6/jawetidowagokopidafu.pdf
    • http://juzuruwe.rf.gd/692246092.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_off0000dbfc.bin
489618df1c6a85fc29c9eabe70ce41b904ae5e8cfa13f46dfdf54f30c0b49a05		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFC 5276 bytes
font_01_sfnt_off0000edf4.bin
dd9bba2568ac180bf6c097294188c09f224b17bd13b4ddac561fe1ae1736a4cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF4 10756 bytes

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