Malicious PDF — malware analysis report

Static analysis result for SHA-256 27594326bdc75135…

MALICIOUS

PDF

71.0 KB Created: 2021-09-25 05:08:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c52d7a197e1ff9e0d4754338417f733d SHA-1: a85bc73a566d9c716d641e54f5e0f85d840171a0 SHA-256: 27594326bdc7513567d283ef3f708a938bac9285cc6ec422ed95af7d07ff3bfb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a large number of external URIs, many pointing to disposable hosting, suggesting a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://crysiq.ru/uplcv?utm_term=android+hacking+metasploit PDF link annotation
    • https://jv-cms.crazy-jessie.nl/uploads/files/61459063163.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/xibodan.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/zetawu.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142abd0b8658---91866858706.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/mepamuvitapeve.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/24/file/vuzuguxowusi.pdfIn PDF document text
    • http://ndt-ultratech.com/files/givegewiwal.pdfIn PDF document text
    • http://www.electricman.in/demo/frontend/web/uploads/files/74278002241.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/genigipirapa.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/61804940739.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/43152309887.pdfIn PDF document text
    • http://bowlingkillers.com/imgdb/files/91917448665.pdfIn PDF document text
    • http://kronospan-mofa.hu/editor_up/wizuzud.pdfIn PDF document text
    • https://chennothinterios.com/uploads/file/42776508125.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/memuj.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/44037570440.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/xenetabuxowakem.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/311272177.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/visatafuridepulogesudo.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/59213352223.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/nefug.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149a7932c793---vuzuzutonadogixutoginevu.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/969815065614069dc3edb3.pdfIn PDF document text
    • http://nhungbaithuocnam.com/img-tvdl/files/95564845774.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/larajovu.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_off0000b09b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B2 11032 bytes
SHA-256: 46bc1e986e4f2dbf2e83c18dfe113dc8c9da9f8496af8233627086d7e41a739a
font_02_sfnt_off0000e1fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FE 16980 bytes
SHA-256: e7f9aaee77a7d1ddacfe66289a38fb70177c911c3362bc5a3ba6097bcab2e195