Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b932e021e016c11…

MALICIOUS

PDF

75.4 KB Created: 2021-09-18 20:50:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1097ab3d3cb921488d6810992bc766f7 SHA-1: aa82da62e23d6e0480f9a9bc85b39596ac831c6d SHA-256: 4b932e021e016c1152ba31e6aa1cc71f4fac86a0ee9015a37879516e2ed1914d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, indicating an attempt to redirect the user to malicious sites or download additional payloads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript points to T1059.007, and the nature of the file suggests it was likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://chcial.ru/uplcv?utm_term=interactive+voice+call+master+for+android PDF link annotation
    • https://kitapkaplama.com/upload/ckfinder/files/861889251.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/67044212542.pdfIn PDF document text
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/rixomafanosib.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc0c7aac1e---64115727884.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/mufigewoxodunuw.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140aa32742f6---28580369657.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/10532028833.pdfIn PDF document text
    • http://aromata.ru/upload/files/jekupufojaxasil.pdfIn PDF document text
    • https://maria-galland.ru/files/file/ferivogijame.pdfIn PDF document text
    • http://solarexperte.ch/fckeditor/editor/images/file/doxufuguvatejuzim.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/tukawepunikesokawi.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/xazix.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/50950542218.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/wotunapisaxobozileget.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40666506679.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/xerurideli.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210901211250.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/1241984023.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/92892355634.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/75468117627.pdfIn PDF document text
    • http://hb-hospital.com/file_upload/fck_upfile/file/5646039818.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_off0000c550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC550 16224 bytes
SHA-256: a069d71428dbbb297485b5f955798e5152d916ee20ce1da09ac86d3b612396cf
font_01_sfnt_off0000ef14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF14 10652 bytes
SHA-256: 17fa87af192c3fff26191340e3ffc1ac98fe0c8c288f74dc45f9f5ff5c7b18f4
font_02_sfnt_off0001077a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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