Malicious PDF — malware analysis report

Static analysis result for SHA-256 b28463237e754307…

MALICIOUS

PDF

69.6 KB Created: 2021-09-19 05:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bd4d5db28703e4dda17440e0bc45312c SHA-1: 4a8fd5cd24742d3467259e4d06e683a114138f67 SHA-256: b28463237e75430742e0f97b5b75e5c90c7bc950e351f008560f679421aeb039
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically identified as a link farm on disposable hosting, suggesting a redirection mechanism. The PDF structure and embedded URLs point towards a phishing or malware distribution attack pattern, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=soul+blade+ps1+iso PDF link annotation
    • http://syarmarka.ru/userfiles/files/60711629384.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/37288986859.pdfIn PDF document text
    • http://odumakus.com/uploads/files/jajafefimupofa.pdfIn PDF document text
    • https://businesslife.com/content/files/82223995856.pdfIn PDF document text
    • https://gastriklandsbf.se/UserFiles/files/36950433882.pdfIn PDF document text
    • https://tebra.si/userfiles/file/53078573360.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/peduxixijibiduxozuneg.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/jipivonedowopusaju.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/798235279.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/35391998640.pdfIn PDF document text
    • http://srmtteaparty.com/uploads/files/202109131907432465.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613486c11ebc2---94767877085.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/91494326064.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/pogunubuxulaf.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/kotarobokowutorelaromoda.pdfIn PDF document text
    • https://vleek.com/uploads/files/nerexal.pdfIn PDF document text
    • https://ewdel.cz/ckfinder/userfiles/files/45168055726.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613eaae8e3a57---63939304212.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/15108970811.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/penepilugoribekewiniwef.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/xunutag.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/37736446242.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/revun.pdfIn PDF document text
    • https://mps-india.com/userfiles/files/97934344539.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_off0000b2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CD 10452 bytes
SHA-256: eb071fbdf210cdf6a1de8acfc176a0267656ec7d522205f0758ad991ee6b6b56
font_01_sfnt_off0000ca65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE277 14892 bytes
SHA-256: f42a0d992b864a7d0831e320963e68e007fb32d4b031a7e467060bc082504d15