Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8d5283cacbdba8…

MALICIOUS

PDF

82.1 KB Created: 2021-02-26 12:04:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 71392eb798bb99045bffc2f2aa489fc8 SHA-1: a1712558444d9be111924b4cff64d543baa2af3e SHA-256: 9c8d5283cacbdba8386c00576642ede54214b8ff6067212a422e4cfdee015b14
96 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, likely used to deliver a secondary payload or redirect the user to a phishing site. The document body, though heavily obfuscated, suggests a lure related to mathematical terms, which is a common tactic for phishing or scam operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://vilenefex.ru/wix?keyword=upside+down+y+mean+in+math
    • https://static.s123-cdn-static.com/uploads/4419822/normal_5fc5a5c37247b.pdf
    • http://1xbet-football.fun/6665630795zrg1b.pdf
    • https://static.s123-cdn-static.com/uploads/4417643/normal_5fc83c930ec7e.pdf
    • https://static.s123-cdn-static.com/uploads/4404745/normal_5fcf434ba4701.pdf
    • https://static.s123-cdn-static.com/uploads/4379485/normal_5fddfc400221b.pdf
    • http://sfr-espace.best/nemamujupedidewuvuba0gowq.pdf
    • https://cdn-cms.f-static.net/uploads/4470231/normal_60158a9622b26.pdf
    • http://shortsomfj.space/walt_whitman_high_school_calendarkbnuu.pdf
    • http://xosuvirakogaf.iblogger.org/letter_of_application_template_for_teachers.pdf
    • https://cdn-cms.f-static.net/uploads/4410954/normal_60357e17356c5.pdf
    • https://cdn-cms.f-static.net/uploads/4454559/normal_6033573107caa.pdf
    • https://cdn-cms.f-static.net/uploads/4409409/normal_601795d2120d2.pdf
    • http://importants.space/unit_secretary_job_interview_questions_and_answersozaa9.pdf
    • https://shorturl.im/pKNL6None
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/zamuriza/74062316358.pdf
    • https://s3.amazonaws.com/davolazupivowi/bixixifuposomivorute.pdf
    • https://s3.amazonaws.com/sojaxub/68075660911.pdf
    • https://s3.amazonaws.com/gedimuta/mofepajofugadonubizuva.pdf
    • https://s3.amazonaws.com/nowokil/equifax_canada_consumer_update_form.pdf
    • https://s3.amazonaws.com/rujabepifar/xezivanapuwatetuli.pdf
    • https://s3.amazonaws.com/jobavo/audit_report_opinion_definition.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee83.bin
6bfa41c66fd05aee6634b933ddc1c80409665c6a4a384f453b1c2770f3ed3d4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE83 5256 bytes
font_01_sfnt_off00010054.bin
998ddb8ebdc90e57594c54d7c4da3b17431fad14b209ab98707d60cc44c10671		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10054 10772 bytes
font_02_sfnt_off0001252a.bin
da10e1bfb11533935e6a350142b2bd851de19bcc192280ef6d040d2b9178f4a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1252A 16208 bytes

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