Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6848343e0a6a9d…

MALICIOUS

PDF

77.1 KB Created: 2021-10-02 11:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b5bfdd92d27c189f7f103e9dc17c1cd2 SHA-1: 6e4b6a58cfcf94ec63f553eb0ffd9cd44a3f21a2 SHA-256: ba6848343e0a6a9ddc75b57d06dc5731c43990a029390c31bb2d0e8f97cb5d15
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. The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and external links point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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
  • 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://smidgel.ru/uplcv?utm_term=another+word+for+plaintiff PDF link annotation
    • http://neodermclinic.com/file_media/file_image/file/tonoxuwuratorom.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/subufaderimud.pdfIn PDF document text
    • http://www.skk.com.hk/admin/ckfinder/userfiles/files/46337319002.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/53986795359.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/wuwuluxivubig.pdfIn PDF document text
    • http://victoryelectricalsupply.com/ckfinder/userfiles/files/77278852078.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/wufemil.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/89203040481.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/mutesilinidol.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/43890180070.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/dc8c5a85ace9c5ba0674a4b9ee51b48c/tomofogujuzufuwusur.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/tofevu.pdfIn PDF document text
    • https://yukkumpulgroup1.com/contents/files/baravodufijujisamotu.pdfIn PDF document text
    • http://pro-group.ru/userfiles/files/gapanaputorep.pdfIn PDF document text
    • http://webminmax.com/userfiles/file/fakusimimafawaxitusumiw.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/tugev.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612eead742b09---wovugepudedunapelono.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/sidixap.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/pabalosulu.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tasosofirinog.pdfIn PDF document text
    • http://cplust.com/upload/serback/files/20211002162446.pdfIn PDF document text
    • https://theipbuzz.com/images/file/kenilamuwufudenijesop.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/nediwosibabenuvoparevi.pdfIn PDF document text
    • https://www.almuhja.com/ckfinder/userfiles/files/43394948914.pdfIn PDF document text
    • https://bukkosdiskola.hu/files/file/27051091193.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/kufuje.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_off0000c10a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC10A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD921 10496 bytes
SHA-256: 99c5fd39ee75d913d47cab64424394633345432343fee0ecdd630d40a61e6b15
font_02_sfnt_off0000f0f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F1 20388 bytes
SHA-256: 4151179df466e5f051ace9926be747e5b150ff713dabc4ded581cbe69353c801