Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b834eef8f2e0204…

MALICIOUS

PDF

73.9 KB Created: 2021-03-04 04:13:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 21441c7d745a8507cdbeb75f35713736 SHA-1: 88c7b8cae76de4fbf960843603334389ef715426 SHA-256: 2b834eef8f2e020403e6c5633832ad35aab53226d66c734e95a6c7428126e740
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous external URIs, including a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body, though heavily obfuscated, contains keywords related to certificates, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://dugedepap.ru/award?keyword=technical+writing+certificate+online+canada PDF link annotation
    • http://dihtyar.online/linevesematofewataboxc5ip.pdfIn PDF document text
    • http://sowaviwexurejo.22web.org/hungry_shark_evolution_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/satasevubu/uyhdxjf/mutukupipugujapesoredo.pdfIn PDF document text
    • http://susurrus.space/when_does_the_titans_curse_movie_come_outgrceg.pdfIn PDF document text
    • http://artelamp.store/geerlik_ve_gvenirlik_almas0u7ih.pdfIn PDF document text
    • http://wulutano.mywebcommunity.org/74059775462.pdfIn PDF document text
    • http://mowefopovog.mywebcommunity.org/88482446741.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/VhejicT/banana_kong_cheats_android_download.pdfIn PDF document text
    • https://cdn.sqhk.co/wufotubi/ja7Agi0/stair_runner_installation_near_me.pdfIn PDF document text
    • http://kapusta.pro/anemia_falciforme_y_paludismoesee4.pdfIn PDF document text
    • http://mybestchan.online/7739699463363wfd.pdfIn PDF document text
    • http://bazis-rostov.com/58468842850xgk0e.pdfIn PDF document text
    • http://jijimaxugixu.22web.org/97910467781.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dogazuzi.epizy.com/automated_testing_for_android_apps.pdfIn PDF document text
    • http://kofaxafogi.myartsonline.com/24051877635.pdfIn PDF document text
    • http://jezevenakos.myartsonline.com/32625003276.pdfIn PDF document text
    • http://saxodanokijaj.atwebpages.com/32356422663.pdfIn PDF document text
    • http://legibevisavu.epizy.com/doctors_sick_note_template_free_uk.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_off0000e54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54D 5144 bytes
SHA-256: 000b50d095747effcce9ff161d62bd3cbe503bf6ded1a45b8399a7eb54c0753a
font_01_sfnt_off0000f6de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DE 10672 bytes
SHA-256: 01dc449c3df76de679b71bcee27456ba254921e85e58ded6c799f1dbcdef1002

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