Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d54588c7bfd505…

MALICIOUS

PDF

81.2 KB Created: 2021-02-19 12:37:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b22f312d3a128ea6c07ada6709ab5631 SHA-1: cef79fab8e68b7d86957b2404996de60713eb124 SHA-256: 59d54588c7bfd5051c3a5a1106aa86830790a717fb5a8c7461807b20d2f7255d
96 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that appears to be part of a lure, referencing 'nouns worksheet high school pdf' to entice users. The presence of external URIs and the ML/ClamAV detections strongly suggest a phishing or malware distribution attempt.

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://maypoin.ru/wix?keyword=nouns+worksheet+high+school+pdf
    • https://cdn-cms.f-static.net/uploads/4448103/normal_60143378778a5.pdf
    • https://cdn-cms.f-static.net/uploads/4421200/normal_602528559b906.pdf
    • http://fevozogu.iblogger.org/catastrophe_theory_arnold.pdf
    • http://com-signto5.xyz/will_there_be_ks2_sats_in_2021ct090.pdf
    • https://cdn-cms.f-static.net/uploads/4490757/normal_602eb7047872e.pdf
    • https://static.s123-cdn-static.com/uploads/4374379/normal_5fe3c94fd778a.pdf
    • https://static.s123-cdn-static.com/uploads/4405413/normal_5ff1c6d293cc0.pdf
    • https://static.s123-cdn-static.com/uploads/4411001/normal_5fd09560859d8.pdf
    • http://save50.pro/nefigatogabixonetagatujhc7xk.pdf
    • https://static.s123-cdn-static.com/uploads/4477649/normal_5feb483b292b2.pdf
    • https://static.s123-cdn-static.com/uploads/4387061/normal_5febc5c29f4ce.pdf
    • https://static.s123-cdn-static.com/uploads/4390330/normal_5ffdd498a27d0.pdf
    • http://bella24.xyz/4593644541o7agk.pdf
    • https://cdn-cms.f-static.net/uploads/4410000/normal_6009bfe856950.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zunuwovadete.epizy.com/actionsoft_geo_tagging_report.pdf
    • http://napilidowolaro.rf.gd/oscillation_mcqs.pdf
    • http://gajubizoj.epizy.com/shark_rotator_professional_stopped_working.pdf
    • http://limulusukad.rf.gd/cute_babies_photo_hd.pdf
    • http://duvufewitopemaw.rf.gd/lafedi.pdf
    • http://tunozesanapi.rf.gd/28210673466.pdf
    • http://xetisovabad.rf.gd/titatikelisorijarakukoxu.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_off000100e6.bin
3233d7cc4cfa555b8216308df76b33f2a0673ac1fb0b8f41352354bccb863608
pdf-font-stream PDF embedded font (sfnt) at offset 0x100E6 5332 bytes
font_01_sfnt_off00011327.bin
55b50be775a0b1f00a98e35b2c3606f0b76780d80c9827e6fc7006a5589c8bbd
pdf-font-stream PDF embedded font (sfnt) at offset 0x11327 10624 bytes