Malicious PDF — malware analysis report

Static analysis result for SHA-256 d775850c09f96764…

MALICIOUS

PDF

98.6 KB Created: 2021-03-13 22:50:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e23f34a3b27c5c1755a689c6092e466e SHA-1: 3d9c8f3123344e5e073c94e86628dbbadb7dfa9d SHA-256: d775850c09f967640197838bba3255781f7325be48baccffba0ab45c21210890
104 Risk Score

Malware Insights

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

The PDF file contains text suggesting it is an 'incident report sample letter for lost receipt', which is a common lure for phishing attacks. It embeds external URIs, with the primary suspicious URL being https://vilenefex.ru/123. ClamAV detected this file as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. The presence of embedded URLs and the invoice/payment lure heuristic strongly suggest a phishing attempt to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/123?utm_term=incident+report+sample+letter+for+lost+receipt
    • http://frukt.fun/totetamavakidegemalotumvgev.pdf
    • https://static.s123-cdn-static.com/uploads/4460043/normal_5fe18dea82132.pdf
    • http://mon-compte-cmb.best/lumegakejekutomegelukopbngdo.pdf
    • http://luminar2-download.xyz/best_performing_mutual_funds_2020_usz1pjn.pdf
    • https://cdn.sqhk.co/pepegejivo/ZicNjcm/us_history_trivia_quiz_test_your_knowledge_answers.pdf
    • https://static.s123-cdn-static.com/uploads/4386828/normal_5ff17d819b1eb.pdf
    • http://biomanua.website/papulubalanoximada5o3wt.pdf
    • http://vinograd.io/tepubimarovilajytiov.pdf
    • https://static.s123-cdn-static.com/uploads/4402503/normal_5ff168482787a.pdf
    • https://cdn-cms.f-static.net/uploads/4461525/normal_601ffe54d0791.pdf
    • https://cdn.sqhk.co/dirodivive/6KtgfTH/shipwreck_grill_menu_bryan.pdf
    • https://cdn.sqhk.co/gaxumisi/Kx5ieYi/noxuwinozofanem.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b47b5c03-260a-428d-a559-0cdcba8189f1/93695174063.pdf
    • http://puredaw.rf.gd/bixanomibefexopeg.pdf
    • https://uploads.strikinglycdn.com/files/2eb1f2bb-56af-4097-abd0-b632352b14bf/compare_slingbox_m1_and_m2.pdf
    • https://uploads.strikinglycdn.com/files/34ec485c-d950-4e36-a540-8fcda0bd7b61/mvc_interview_questions.pdf
    • http://lolowavedipugis.rf.gd/cerner_powerchart_app_android.pdf
    • https://uploads.strikinglycdn.com/files/83918b06-77c4-4654-8898-04b641e76a1d/31721668838.pdf
    • https://uploads.strikinglycdn.com/files/1484e071-d276-4a78-a72b-0e4f5e322956/how_much_are_english_classes.pdf
    • https://uploads.strikinglycdn.com/files/53644908-9425-45f3-bf7c-bda130ea90a5/attack_on_titan_season_1_opening_full_song.pdf
    • http://jujiruweji.epizy.com/27948564426.pdf
    • https://uploads.strikinglycdn.com/files/a32fb0ad-b28a-4ee9-ae1d-404b54fc48b6/bonomu.pdf
    • https://uploads.strikinglycdn.com/files/f7c8cf45-eb79-4e32-bb2b-c0f10764cd44/kuviwivi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013c88.bin
a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13C88 2828 bytes
font_01_sfnt_off00014682.bin
dac4791d364efe0e3930a959262ef345f085f761030d52147ae84ccfcfe081d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14682 5236 bytes
font_02_sfnt_off0001583a.bin
04ec5210294fe009effba091ac24caee3b9e01ff8bde348bc3f57735532c7059		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1583A 9932 bytes

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