Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c6583a06a2fcac5…

MALICIOUS

PDF

75.6 KB Created: 2021-03-14 10:11:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8aa6a8a84ca381fbba1dbf2d9f8f5cfa SHA-1: b042f91d276edd6a347781faf308f2ee4e5209bd SHA-256: 3c6583a06a2fcac506bf8bd56b51ad25f76a301a79dfa25946667e0d3bfe1ace
104 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'download button' heuristic and an embedded URI pointing to a PDF file suggests a phishing or social engineering attack aimed at tricking the user into downloading further malware. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/award?keyword=autocad+3d+tutorial+pdf+download
    • http://gedawirij.66ghz.com/atavus_tackling_test_answers.pdf
    • http://sodazetibup.iblogger.org/wexewa.pdf
    • http://rabejagoruwobol.66ghz.com/ethereum_mining_guide_2018.pdf
    • http://nafarami.medianewsonline.com/network_security_engineer_cv_sample.pdf
    • http://rexonina.medianewsonline.com/how_to_adjust_speed_on_club_car_precedent.pdf
    • http://dadevizevarek.scienceontheweb.net/8535359081.pdf
    • http://xivisugewikoju.iblogger.org/google_cloud_machine_learning_tutorial.pdf
    • https://polavimiwusirew.weebly.com/uploads/1/3/2/6/132681763/wimezawa.pdf
    • https://ramexolilaburav.weebly.com/uploads/1/3/4/3/134331107/4b9e2830d73.pdf
    • https://vovisomesosaza.weebly.com/uploads/1/3/4/4/134462399/sarigelinoje-xexusamilozi.pdf
    • http://mevesepegubisis.scienceontheweb.net/a_raisin_in_the_sun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ce95f9c3-52d6-4d32-9216-9262fe4daad0/pufawepejexupenizakowe.pdf
    • https://s3.amazonaws.com/dojivewobasuval/cosco_scenera_next_dlx_convertible_car_seat_manual.pdf
    • http://jujewejono.epizy.com/51981716381.pdf
    • https://s3.amazonaws.com/mudurixo/cant_stop_wont_stop_book_free.pdf
    • https://uploads.strikinglycdn.com/files/9f8d2eea-00a6-4516-86b2-1fb633051688/65430321635.pdf
    • https://uploads.strikinglycdn.com/files/71861684-cd1c-496d-b4ff-cf417fbf7a17/dusitonavatodenoj.pdf
    • http://dokozew.epizy.com/lamigufulosifinaj.pdf
    • http://beximor.epizy.com/13153340727.pdf
    • https://uploads.strikinglycdn.com/files/31b656ed-f059-4be9-a0c9-0e401a7594ba/les_miserables_broadway_show_length.pdf
    • http://tewidunutazi.rf.gd/94386515239.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_off0000e8b3.bin
6d7d21ced6e65b6d51935e9a2819ef8006e3dbbe2a597eb543f7aed4ca9770dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B3 5216 bytes
font_01_sfnt_off0000fa9a.bin
c26b244b43d8dbff8e97e2d188c20ab67366292788ab6b818deb09e12e148f77		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 10808 bytes

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