Malicious PDF — malware analysis report

Static analysis result for SHA-256 276ef25cad652e83…

MALICIOUS

PDF

89.5 KB Created: 2021-05-16 07:57:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 928a52fb9e89b67b19921c48428cc627 SHA-1: e0b9f459707a05662cedd2e0188ecd242ce0cfd0 SHA-256: 276ef25cad652e83880ff4392900ff12db026dece216ca392d4ff2d6a1551ede
96 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 ClamAV detection and an ML classifier, indicating malicious intent. The document body contains a deceptive title suggesting a personal issue ('Is it worth saving my marriage') likely intended to trick the user into clicking the embedded malicious URL. No scripts were extracted, but the presence of an external URI points to a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://crophysi.ru/strik?utm_term=is+it+worth+saving+my+marriage
    • https://cdn.sqhk.co/fukafodifi/erZhbjf/answer_key_of_tallentex_2020_exam.pdf
    • https://cdn.sqhk.co/nuzitomizaj/TnjaieB/sizudo.pdf
    • http://zisapawiwako.mypressonline.com/the_dead_sea_scrolls_bible.pdf
    • http://gokojun.scienceontheweb.net/lexical_and_grammatical_categories.pdf
    • https://cdn.sqhk.co/denirinodo/iijjphh/25809435569.pdf
    • http://rowaxamapitowej.getenjoyment.net/5307503122.pdf
    • http://lavijowonuxogu.22web.org/nabivepibu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wulotugadag/kenmore_sewing_machine_repair_manual_free.pdf
    • https://uploads.strikinglycdn.com/files/eb64ffd7-afb7-4c65-b889-c797113b3c19/braava_380t_beeps_while_charging.pdf
    • https://s3.amazonaws.com/kudowo/aviary_portrait_effect_apk.pdf
    • https://uploads.strikinglycdn.com/files/94d776ae-758f-4b88-8f81-21ae6d5602d9/ruwapofakabiluvetabonezud.pdf
    • https://uploads.strikinglycdn.com/files/83be9982-5160-4803-b8e1-eb451650b407/dofifaxunufuwuzusibukufag.pdf
    • https://s3.amazonaws.com/jarawaxanivu/91682938479.pdf
    • http://duvodix.myartsonline.com/how_to_work_out_the_margin_of_safety.pdf
    • https://uploads.strikinglycdn.com/files/6f368d28-540c-4f4f-866d-f1e9e9473662/58263867713.pdf
    • https://uploads.strikinglycdn.com/files/42bd3699-8dda-4cfe-9feb-889950a3353c/best_mechanical_keyboard_for_gaming.pdf
    • https://s3.amazonaws.com/nerugiraxura/44073189838.pdf
    • http://nuzebavin.epizy.com/90870586152.pdf
    • http://wipidomi.rf.gd/bus_eireann_109x_timetable.pdf
    • https://s3.amazonaws.com/fodose/confidant_guide_futaba.pdf
    • http://tasefabomodewiv.epizy.com/bus_wali_game_video.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_off00011f6e.bin
37dbdc2f264c216f89c288edc74ae4a4035e7e311c76dcb56def5c737f840f41
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6E 5256 bytes
font_01_sfnt_off00013144.bin
f9062a33d9f05d29e63a3a03061ab5678e926df900a83fc9ebc910e7bd206657
pdf-font-stream PDF embedded font (sfnt) at offset 0x13144 11496 bytes