Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf05b6851bb2ae89…

MALICIOUS

PDF

81.3 KB Created: 2021-09-23 05:36:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b7b5c1cbcb6552ca83880287c7c7fede SHA-1: b8b3fa1b9be3f0bca896ee879a2715932e9c5162 SHA-256: bf05b6851bb2ae89357d28fa3ca964ab32a908c345a8f2235c5fde705b12e160
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains, suggesting a link farm designed to lead users to potentially harmful content. The presence of a 'download button' heuristic further supports the idea that the document is a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://cructi.ru/uplcv?utm_term=download+fate+of+alakada+full+movie PDF link annotation
    • https://camerabentrenet.camerabentre.vn/ckfinder/userfiles/files/ruvaloxagepuwozowavu.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/lagogesukorirozopamijo.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/84587734497.pdfIn PDF document text
    • https://jurvamartin.com/userfiles/file/43167301993.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/5122808343.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210901123131.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles/file/gukesewujubiw.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/dubes.pdfIn PDF document text
    • http://designbyjoseph.com/uploads/File/dilikitovodegafo.pdfIn PDF document text
    • http://lepixz.com/userfiles/file/kawut.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/nasedazaxan.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/lotonurar.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/ponekewoludekavutoke.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/kidas.pdfIn PDF document text
    • http://spzpoz-zdunskawola.pl/upload/file/subewepoluluvonelete.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/zefikezitorexitime.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/21738383125.pdfIn PDF document text
    • https://tcremich.lu/files/files/bawexaze.pdfIn PDF document text
    • https://marathonlaval.com/userfiles/files/dosakegimokun.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/melopumifugotoximulipexe.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/dijarimoxozisimusixudev.pdfIn PDF document text
    • http://potentialdesign.cn/userfiles/file/1631388708.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/161493aff4e93f---70299090932.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/senil.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/82675385546.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210913220823.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_off0000d593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD593 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA5 19020 bytes
SHA-256: 1fea4f2bf4254190445b6ff3b843f8c62c49262f919dedd1c8bd8874681a55d2
font_02_sfnt_off00011f0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0A 10592 bytes
SHA-256: 76028350e6d772470393ba6b3980f3be58c61fa83c944d133a49ca0300450e93