Malicious PDF — malware analysis report

Static analysis result for SHA-256 d328037612b55349…

MALICIOUS

PDF

79.4 KB Created: 2021-09-09 02:48:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 35ddb008a9f69fa4640e8f96fb28425e SHA-1: 1fc2042a355701df8bd25204b0c99625ef088842 SHA-256: d328037612b55349ed2b9dfe5b6fca218a3d1b2e7f5eca1c49c1ace7cb83eff1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains, suggests a phishing or link-farming operation. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=cara+reset+hp+samsung+young+gt+s5360 PDF link annotation
    • http://allnatureint.com/userfiles/file/52691483502.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/79069313735.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/92261993358.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/74377489695.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/budosu.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021090217235712.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/penegubaranamik.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/88051392295.pdfIn PDF document text
    • http://maidichike.com/upload/files/86836011036.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/dedur.pdfIn PDF document text
    • http://spain-ex.com/images/blog/file/87640701503.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/98685157453.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/lafisimuvoratizilepurujix.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/94798134750.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133b1a26f494---86805865554.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/76261529037.pdfIn PDF document text
    • http://hzxf.com/images/upload/File/jedakoxeboba.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/nopatenosokumo.pdfIn PDF document text
    • http://www.cenlafilm.com/siteuploads/editorimg/file/90777898797.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136be3f93fa6---11045425064.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/87503940555.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/sipizexonazeser.pdfIn PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/mabebafalulowebam.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_off0000d05a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05A 17208 bytes
SHA-256: bd950660b68c212a0cefd4c0eea86243074714b17ca362ffb9b4c766f4c7be33
font_01_sfnt_off0000fd45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001155c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155C 11404 bytes
SHA-256: 2beecee72207b336795810ada0389c6a8e8cb2f0b22fd52ac583e0e0c3dbaa8a

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