Malicious PDF — malware analysis report

Static analysis result for SHA-256 759f37b8564058e3…

MALICIOUS

PDF

81.6 KB Created: 2021-09-10 17:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4f441fd05eb37640eade7491af163269 SHA-1: 46cb4414a4dc0881ebee19332e9b2516c0dfa1a2 SHA-256: 759f37b8564058e3f210a39d49d9efe7e2c05d63f481f2eac050adc1db7ec344
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://wastran.ru/uplcv?utm_term=elon+musk+tesla+spacex+and+the+quest+for+a+fantastic+future+download+pdf PDF link annotation
    • http://ppfi-online.com/userfiles/file/sajadujuloludadozasuduvox.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/43650287541.pdfIn PDF document text
    • http://lejuriste.ru/files/file/dupogoguduxajigigimunum.pdfIn PDF document text
    • http://proxima-design.cz/files/file/rupufadejenadaranovi.pdfIn PDF document text
    • https://aeternoplanning.com/ckfinder/userfiles/files/davegakikagoledumutu.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/mofamawolowagirakipa.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210908124733.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/3836079387.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/95276116011.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/mubivumosagi.pdfIn PDF document text
    • https://aparcaderoshaddaichile.cl/uploads/images/files/pavagakepetofob.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/45258662968.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/jolovusuxerebe.pdfIn PDF document text
    • http://rescue119.org/userfiles/file/damasidejojefa.pdfIn PDF document text
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/vevuwakobofuw.pdfIn PDF document text
    • https://mygrind.ie/userfiles/file/tajuvubup.pdfIn PDF document text
    • https://aykutemlak.com/upload/ckfinder/files/raxelemufovidaz.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/8322329416.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD46C 18580 bytes
SHA-256: d4b1506ee714976c4452155aaae998a5b7a754c07b324a12df18a3c03d94b1d8
font_01_sfnt_off00010599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10599 11392 bytes
SHA-256: 270023f57bddcce734f44179146549d6702236572207244bbd228ae60db4f502
font_02_sfnt_off0001201f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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