Malicious PDF — malware analysis report

Static analysis result for SHA-256 da5d2a8fe17254c4…

MALICIOUS

PDF

86.1 KB Created: 2021-09-18 11:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2a6cc6838f334ad536a7032ea9f8b0e0 SHA-1: 10ecd8665164c2f5ca7482a32247357bad65996d SHA-256: da5d2a8fe17254c4cd3ded63b1de3a6ff184132fbec320d97b84b6a693a2df24
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external links, many of which point to disposable hosting, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic and a high ML score indicate malicious intent, likely to trick users into downloading a payload. ClamAV detection further confirms its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://drafthe.ru/uplcv?utm_term=a+christmas+carol+readers+theater+pdf PDF link annotation
    • http://anadolumatbaa42.com/genelresimler/file/tixuvetuful.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/66166259195.pdfIn PDF document text
    • http://origo.ws/userfiles/file/47844378007.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/mowuvagifapabajutewitenu.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/pelijijixin.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/69619114963.pdfIn PDF document text
    • http://qdcmd.com/data/files/19090753059.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/71320970331.pdfIn PDF document text
    • http://www.offshoreyachts.net/web_upload/editor/files/fexomapowaweniniduvi.pdfIn macro / runtime command snippet
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/85021683654.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/38910498283.pdfIn PDF document text
    • https://emartdeko.pl/galeria/file/73917443561.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210912092334_wtjz42.pdfIn PDF document text
    • http://archifolder.com/userfiles/files/noxuru.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/86315714423.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210916000156609510bunrr.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/linamewiwevuzezipewu.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/86002500057.pdfIn PDF document text
    • http://yugreat.com/filespath/files/20210902122635.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/83548548122.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/d619805254b1ba8372d4b460eca24a23/kubosiv.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/vubomevaxira.pdfIn PDF document text
    • http://edallyshop.com/upload/files/dojagino.pdfIn PDF document text
    • https://sim2007.com/files/xeximukodezewajup.pdfIn PDF document text
    • https://samsunyapi.com/usIn macro / runtime command snippet
    • 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_off0000e988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE988 18856 bytes
SHA-256: 093d041cdb99dad36f083977d0e6e09c415da0d4e3d01cc487161c4090393846
font_01_sfnt_off00011a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001322a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322A 10760 bytes
SHA-256: 7a1b1c0569099efa7bd4120fbc27f130d6c24e9fb81a4f25be721894c681fdf3