Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1cd896f87dd2399…

MALICIOUS

PDF

78.3 KB Created: 2021-03-24 21:02:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 530870959fe87ff0073ba9d180187190 SHA-1: ec28d959feb3e37bb314bbefbb4824f8fe827672 SHA-256: a1cd896f87dd2399d66197bbd2dce71381a920c121d92a6363430fa8f5cfca85
96 Risk Score

Malware Insights

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

The 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 a suspicious domain, likely intended to trick the user into clicking it. The document body, though heavily obfuscated, appears to contain keywords related to the URI, suggesting a phishing lure.

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://soxebez.ru/award?keyword=per%25C3%25B3xido+de+benzo%25C3%25ADla+pdf
    • https://static.s123-cdn-static.com/uploads/4378164/normal_5ff30380258a5.pdf
    • http://olipaka.xyz/is_exercise_good_for_osteoporosismtz3v.pdf
    • https://cdn.sqhk.co/duravukikemo/g2Ziihd/33569056683.pdf
    • https://cdn.sqhk.co/bopelara/mbijCDT/clue_game_sheets_free.pdf
    • https://cdn-cms.f-static.net/uploads/4452837/normal_6039f1ce09288.pdf
    • http://lenudes.com/clue_tracking_sheet_online0iva3.pdf
    • https://cdn.sqhk.co/nomavunut/akk7Ghi/73895085326.pdf
    • https://cdn-cms.f-static.net/uploads/4368770/normal_6056d4e9d9bc6.pdf
    • https://static.s123-cdn-static.com/uploads/4459776/normal_5ff497c02d881.pdf
    • http://polikarmonolit.ru/dark_souls_2_scholar_of_the_first_sin_reviewskiec.pdf
    • https://cdn-cms.f-static.net/uploads/4468551/normal_600e39655f36a.pdf
    • https://cdn.sqhk.co/navimoxa/iikAmjc/8824660121.pdf
    • https://cdn.sqhk.co/mekurapiw/iigjsef/red_ball_4_unblocked.pdf
    • http://mapenibo.scienceontheweb.net/gesonizurinezuzujinuzunus.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b6f97e74-198a-461d-a312-d71b9712332b.filesusr.com/ugd/a2d007_9066b1e51b79419ea5c8dcd316836c47.pdf?index=true
    • https://s3.amazonaws.com/fadedosi/1648116832.pdf
    • https://9539e3d7-93ad-434a-85ac-22bd9bdb82bb.filesusr.com/ugd/df7b34_dd99aa7f98214d48991898ca823d1f99.pdf?index=true
    • https://6e37e838-c278-4d46-baa9-25b8497af200.filesusr.com/ugd/fbcb80_9265ba35ee584adfacd1eafe5860b881.pdf?index=true
    • https://s3.amazonaws.com/tejuvonixag/21495672449.pdf
    • https://s3.amazonaws.com/pajeriramal/19015407300.pdf
    • http://minivenema.atwebpages.com/10630222304.pdf
    • https://0a3c8164-ddd9-4522-8472-457ce31ece15.filesusr.com/ugd/d32f78_6c0c54bb3ce64884be3a70676d1377d3.pdf?index=true
    • 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_off0000ee20.bin
0a01fb9877da8fd47303e11bc765499fc03cdc06376b32153f6a89ce4dca4e26
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE20 5304 bytes
font_01_sfnt_off0000fffa.bin
226a40a075bae7f1d61b9b67dbf7307b851d1f74677988589ea9e78bca11ee8d
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFA 13680 bytes