Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3cc0731593ec080…

MALICIOUS

PDF

74.8 KB Created: 2021-03-19 12:07:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9057fbf9099a5bb06ade8c08cfefc9ad SHA-1: 2777face4e45e80e2861f741dbc8d7acce32ccb7 SHA-256: c3cc0731593ec0804824e1e5527d285530f4fe2d85be12d1f43ff06c20c19c24
96 Risk Score

Malware Insights

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

The PDF file contains a lure related to obtaining free answers for math problems, directing the user to a suspicious URL. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest an attempt to exploit users through a malicious link, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://seumenha.ru/strik?utm_term=how+to+get+free+answers+on+mathway
    • https://static.s123-cdn-static.com/uploads/4385012/normal_5fc6e0969a3d5.pdf
    • http://segaruzobuguses.scienceontheweb.net/how_to_make_a_kallax_shelf.pdf
    • http://kakolamilasaru.medianewsonline.com/dinoxaf.pdf
    • https://cdn-cms.f-static.net/uploads/4450638/normal_6037b9afd623c.pdf
    • http://tusapet.iblogger.org/bekesupetuvofetazuf.pdf
    • http://pizovanijeb.22web.org/60991413834.pdf
    • http://wufamega.scienceontheweb.net/ganuraxibowidonozij.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/46996b06-2923-412f-a79a-1ef27d6e855e/31513447146.pdf
    • http://torumaxot.rf.gd/aa_mirror_apk_no_root.pdf
    • https://uploads.strikinglycdn.com/files/069dc3bd-90c8-4569-b42e-2bb43a157be9/ovid_metamorphoses_book_14.pdf
    • https://uploads.strikinglycdn.com/files/724b7658-9140-4f5a-af87-a3a5eb614380/what_streaming_service_makes_the_most_money.pdf
    • https://uploads.strikinglycdn.com/files/e5b35779-1509-4d37-9330-633dddeed93c/sat_test_prep_courses_near_me.pdf
    • https://uploads.strikinglycdn.com/files/32bd5cba-6732-4b6f-a85a-98da25ffaeb0/the_man_in_the_high_castle_3_trailer_ita.pdf
    • http://rusobuxun.rf.gd/88992470271.pdf
    • https://uploads.strikinglycdn.com/files/ff5bc827-539f-4581-8dcf-d57301b2a08b/68997197958.pdf
    • https://uploads.strikinglycdn.com/files/16a4ca72-d885-4e08-9744-3dde797b7ed6/71311281470.pdf
    • https://uploads.strikinglycdn.com/files/05e4540f-5ccd-4e89-9308-a935a3692f4b/counseling_the_culturally_diverse_theory_and_practice_7th_edition_apa_citation.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_off0000e590.bin
7a1a1bb73e1c8e9ec3e8a47f352cf0c4094ec30f310b5add4c2ea6fcf296cfc3
pdf-font-stream PDF embedded font (sfnt) at offset 0xE590 5304 bytes
font_01_sfnt_off0000f794.bin
66fb85a6ddaca6585885fd43fb762d3b56ae05816632e73f8d7231521bce81cb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 12208 bytes