Malicious PDF — malware analysis report

Static analysis result for SHA-256 438eb3e935e63b28…

MALICIOUS

PDF

95.9 KB Created: 2021-03-23 15:26:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 145af20f0626770e8e4c79ee5421f9b0 SHA-1: d15d8c90b501054f5113088bccfac59f1d2440d0 SHA-256: 438eb3e935e63b2849856b2739f0fbc660058758c09f17e921619342a7d08564
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. The document body, though heavily obfuscated, contains text related to a search query, suggesting a lure. The embedded URL points to a domain that is likely malicious and serves as the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://mezovuduw.ru/award?keyword=mahabharata+full+story+english+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366364/normal_5ffcae8a08425.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405185/normal_60226bb10942a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379720/normal_6014fc53aad93.pdfIn PDF document text
    • http://totalcreditreport.info/358143913171nye5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453909/normal_5ffc6455d1cee.pdfIn PDF document text
    • http://wumomotetidofe.getenjoyment.net/what_did_the_brown_vs_board_of_education_court_case_ruled_unconstitutional_in_1954.pdfIn PDF document text
    • http://senteber.site/11443275002ohva1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485012/normal_600b37fa64853.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382407/normal_5ffbc3e22f5e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449998/normal_600713e811cb6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404112/normal_6008bfa89d1f0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425738/normal_5fe6daa45b51c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377115/normal_5ff6784bef992.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366347/normal_6048300b31d78.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/71993152-e0d5-4c0e-b982-09b76ba75cce/27023537367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2802f0e1-0e10-4527-9bf0-1cdbec31d2a2/vivofit_junior_3_black_panther.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c21577b-87bc-47dc-a966-5e7ee4f19fda/how_to_say_i_want_to_draw_in_japanese.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d40ccaf-da8b-4b78-959f-ce259374f8dc/39376789810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70b2f5e7-2cf0-4428-a36a-55fa90e58478/73235614705.pdfIn PDF document text
    • http://sipanokule.onlinewebshop.net/netgear_ac1900_or_ac1750.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013a9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A9E 5548 bytes
SHA-256: 91b650db0dc6b079c29eb5d7a2f0cb47ea7a73ed6702463f1ff02fe73e7c26e2
font_01_sfnt_off00014d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D89 11056 bytes
SHA-256: 97eab2e0a9b5b6ac4bea9ba0bb75eb1c27206e07baf001bdeb582eb3f478c301

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