Malicious PDF — malware analysis report

Static analysis result for SHA-256 d398f300c9a1e761…

MALICIOUS

PDF

70.9 KB Created: 2021-09-20 04:37:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 26dc8b8caa9a3afb17036baa9153cf69 SHA-1: 807c83a8025bfa50e8a6b1dcce4b94f09f460d20 SHA-256: d398f300c9a1e7611fb55dd0b9536ddf6197c053e78a4e3dd3027776215af93e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is a link farm designed to direct users to various external sites. While no scripts were explicitly extracted, the presence of numerous embedded URLs points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5763

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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 http://csc0512.com/userfiles/file/20210904221115_lsc5gs.pdf In PDF document text
    • https://itandem.net/ckfinder/userfiles/files/39998656546.pdfIn PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/4888227670.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210913223033.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/ranatij.pdfIn PDF document text
    • http://aquatherm-graz.at/files/33384403092.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/wanidigezabeki.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/vimixuwamelame.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/15483679e14cf13aaaf2efba8f4ab25f/jamosebejimatovomexe.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/8acaea4e1642c081f1fce8170054b1c7/1572007124.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/tifubupesamawipejipu.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/vebumiw.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/saluvusuwomebugup.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/44005838395.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/20219754517254.pdfIn PDF document text
    • http://ntep2008.com/UserFiles/File/resamewuzafonubulezajof.pdfIn PDF document text
    • http://fivelscope.net/fckimages/25877198756.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/lekasowelasakiwebo.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/98308783904.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/44191626231.pdfIn PDF document text
    • http://sasnowosielski.com/ckfinder/userfiles/files/xixorilaralamoresetoweza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=eliminar+historial+busqueda+google+androidPDF link annotation
    • 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_off0000b868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB868 18844 bytes
SHA-256: bb8c5bdfc64fd6f5f978a40f85838ac254cab128bb25e204d0621c6b5511e8fd
font_01_sfnt_off0000e7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF0 11064 bytes
SHA-256: 49433eb347f3755ca63c2adcd5db8f5724ae7af18592fca1dcb6714148f2eacf

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