Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99f022c2861cb14…

MALICIOUS

PDF

122.9 KB Created: 2021-04-02 17:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: fab195349728844692148cf236f7de9a SHA-1: 3c7f3312adba950bafd94631da68c3ef925259ec SHA-256: c99f022c2861cb1483aad5be72fdd22ab5339db5f103eb6fb432eb98b9483eb3
96 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI pointing to 'https://maypoin.ru/award?keyword=iphigenia+at+aulis+pdf', which is highly suspicious. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the presence of external URIs and the malware detection strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/award?keyword=iphigenia+at+aulis+pdf PDF link annotation
    • http://svarka-aurora.online/switzerland_crs_reporting_deadlinerg4kx.pdfIn PDF document text
    • http://chelamela.org/48772200652x0udb.pdfIn PDF document text
    • https://cdn.sqhk.co/xomakonezema/jgrifhg/zajabunepinegogiviv.pdfIn PDF document text
    • http://prod-fruit.space/livro_genetica_veterinaria7a9ke.pdfIn PDF document text
    • https://jefomigakugilo.weebly.com/uploads/1/3/4/5/134597358/pululozu-ronafam.pdfIn PDF document text
    • https://cdn.sqhk.co/bugininaxi/VjcwXkv/27505849099.pdfIn PDF document text
    • https://mibinataxufix.weebly.com/uploads/1/3/1/4/131438539/zepakuduxuje.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/ha99jfb/75171814570.pdfIn PDF document text
    • http://useplafond.xyz/change_wordpress_user_login_url_urlriz75.pdfIn PDF document text
    • http://reduslim-sito.site/weripibemidibixafnj82t.pdfIn PDF document text
    • http://gvidilon.ru/86961339033aurqx.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/fkifiiU/inspirational_stories_about_change_in_the_workplace.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/outlook_for_windows_10_desktop.pdfIn PDF document text
    • https://s3.amazonaws.com/neporezofov/what_can_be_done_to_prevent_police_brutality.pdfIn PDF document text
    • https://f89b8795-a90f-4359-81e0-6309601a98d9.filesusr.com/ugd/8e7730_cf8a66b6d28a4c25a992939f8cfd05a9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nijudow/88217504898.pdfIn PDF document text
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_8682e3785b844b51b25cb76374b16774.pdf?index=trueIn PDF document text
    • https://5fa60de5-32ab-41ac-ba65-77330e21e623.filesusr.com/ugd/2e16aa_aa44581e4b8843bf9c9119e7f9087624.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/2018_monthly_calendar_editable.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/mariage_d_amour_piano_sheet_music.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_off0001a9dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A9DD 5144 bytes
SHA-256: f47738c1a2865acd09d747fa04fc719fe47569d41add5a8591814b8b5b6c41dc
font_01_sfnt_off0001bb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB64 10416 bytes
SHA-256: f5dec95e256ac297e93b90810787417ec3bba2342ea6c0d95acb4e3944da3b1a

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