Malicious PDF — malware analysis report

Static analysis result for SHA-256 42e643e3d9ad6eea…

MALICIOUS

PDF

73.8 KB Created: 2021-09-17 05:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6510aa5693b1a874574b779f2563cafb SHA-1: aedd68ebd47dc4f53fdf9a88d67b5b4beb3b0f50 SHA-256: 42e643e3d9ad6eead9a751ce3da36463830a9904448c0da7dbc70cff12013ace
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of embedded JS points to T1059.007, and the overall delivery mechanism is consistent with T1566.001.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://chcial.ru/uplcv?utm_term=find+the+angle+in+radian+through+which+a+pendulum PDF link annotation
    • http://lienming-rubber.com/uploads/files/202109092251398808.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/94952934890.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/segozidisenuf.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/75722106914.pdfIn PDF document text
    • http://unseretochter.ch/images/file/44450731700.pdfIn PDF document text
    • https://cathita.vn/upload/files/37978991209.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/5122535557.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/regofefafemujozadezuwuniv.pdfIn PDF document text
    • https://adamslakeband.org/userfiles/file/41712285228.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/seloxokixazejimasoxezolo.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/seguruludi.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/wekobosumawi.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/37430104116.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/wibiniboxulu.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/51394194184.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/rifevanigegoz.pdfIn PDF document text
    • https://85097781.com/upload/files/gagapesorapus.pdfIn PDF document text
    • http://machulski.com/public/file/34052102913.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/90218513356.pdfIn PDF document text
    • http://cocoal.com/uploads/file/besatejigadugenu.pdfIn PDF document text
    • https://tierrettung-in-katalonien.org/ckfinder/userfiles/files/nofususefaxaxebe.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/65728252569.pdfIn PDF document text
    • https://kristinanamaste.eu/files/74304187201.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/53682698882.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_off0000bbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC8 10956 bytes
SHA-256: f8b429e716a582ab4688bf2765e4a4c5d3979cc23c1e2d29bad90d585bd12660
font_01_sfnt_off0000d4c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C1 17264 bytes
SHA-256: 5d581dc7f53bffe926411fc6ad74e9df10876de21beaec2a541966b3e61e6cb0
font_02_sfnt_off00010124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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