Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ca6254008ae461…

MALICIOUS

PDF

234.8 KB Created: 2021-02-12 18:52:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f5042554d076b666ec996acf10aeae77 SHA-1: 816efcbb168ac137df4b021e37cf091ae6202c59 SHA-256: 43ca6254008ae461cff65556e556517f10dd77e3a70f93c9fd032681962e2838
96 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. It contains an embedded URI pointing to a suspicious domain, likely a phishing lure. The document body, though heavily obfuscated, appears to be a deceptive lure related to 'Introduction to econometrics'. No scripts were extracted, but the presence of external URIs suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://baarspo.ru/123?utm_term=introduction+to+econometrics PDF link annotation
    • https://tovibimatajo.weebly.com/uploads/1/3/5/9/135963052/kidawawapijezom.pdfIn PDF document text
    • http://deemonatrafik.xyz/rockstar_north_games_for_pch5n04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380209/normal_60073824bd6c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408009/normal_601acdf72a293.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447276/normal_5fc81a50017e9.pdfIn PDF document text
    • https://bunixidulot.weebly.com/uploads/1/3/5/9/135964284/zefed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484154/normal_5ffd5693cf7c8.pdfIn PDF document text
    • https://fazajamol.weebly.com/uploads/1/3/2/7/132740605/e019536e.pdfIn PDF document text
    • https://duvozeja.weebly.com/uploads/1/3/0/7/130739152/9742551.pdfIn PDF document text
    • https://dekomowunine.weebly.com/uploads/1/3/4/6/134638227/4549724.pdfIn PDF document text
    • https://vekowafonomi.weebly.com/uploads/1/3/4/6/134692424/xitelabanodom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497353/normal_602474e21ceae.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00036113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36113 4780 bytes
SHA-256: f217ce0ccc029613ee887be295780453e50624c5d7b4d582ff1523e0b2f18ee7
font_01_sfnt_off0003713b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3713B 13808 bytes
SHA-256: 3b0abb4848ccfeda08b932347a5e91aa1ef79c24116a198069eefb5aaf14d140