Malicious PDF — malware analysis report

Static analysis result for SHA-256 d395faca65b53707…

MALICIOUS

PDF

69.3 KB Created: 2021-02-20 04:44:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb19eb0979b96f420b49ed7b0bb2f832 SHA-1: 75b8fcc3a875c6769e063e202863ee6e602a7d12 SHA-256: d395faca65b537070598a365b2a13a66e4a531fdf57fd4e8c15e9b6b42f7c051
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to a suspicious domain, likely intended to trick the user into visiting a phishing site disguised as a student enrollment system. No scripts were extracted, but the PDF structure and embedded URI strongly suggest a phishing attack.

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://crophysi.ru/123?utm_term=student+information+enrollment+system
    • https://cdn-cms.f-static.net/uploads/4500895/normal_60243bd87301d.pdf
    • http://mainsale.info/tikenubusamonojile2o2it.pdf
    • http://fortuneo.biz/fur_elise_sheet_music_freemdc6g.pdf
    • https://static.s123-cdn-static.com/uploads/4470980/normal_6004f898a3f76.pdf
    • https://cdn.sqhk.co/dibidoretu/dhicig9/red_war_campaign_2020.pdf
    • https://cdn.sqhk.co/nonuripot/SWfBQjb/44099931081.pdf
    • https://cdn-cms.f-static.net/uploads/4425010/normal_602fa5190a286.pdf
    • http://tophomework.space/calculus_early_transcendentals_sullivan_miranda9b0c6.pdf
    • http://hyipinvest.site/catia_v6_student_version_freei3klx.pdf
    • https://cdn.sqhk.co/bumotinidopi/hhigNji/duwevulojuko.pdf
    • https://static.s123-cdn-static.com/uploads/4388162/normal_5feb421895036.pdf
    • http://milansit.space/xiwetesefeneruodl.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/kefiperizonofu/53009697177.pdf
    • https://s3.amazonaws.com/wifiduxezo/descargar_whatsapp_plus_2018_gratis_con_apk.pdf
    • https://s3.amazonaws.com/gezejoputiwinu/wubobuki.pdf
    • https://s3.amazonaws.com/farowug/82342701016.pdf
    • http://jefelaxe.epizy.com/77714739749.pdf
    • https://s3.amazonaws.com/gisujubolidine/39670533844.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_off0000d3f9.bin
5ff09301b79bf47f3aa2771a03a095fdd0856fef7f886eee80399f5e5ae34c85		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F9 5260 bytes
font_01_sfnt_off0000e5c3.bin
23d972d94f4f78c53de900fcdf9fe09f6cb7aba7f50711515a45bfe173b42fae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C3 10088 bytes

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