Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f35caf28a5caadb…

MALICIOUS

PDF

70.3 KB Created: 2021-09-19 08:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 70d6b8c12cd65b66ff1c0814b23e1af0 SHA-1: e5775135c13c323312a3b33f4d9a90c97f80546b SHA-256: 9f35caf28a5caadb45e63516665e8e253843df6674777a59f88f7827de701d12
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or link-farming attack pattern. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://laborke.ru/uplcv?utm_term=how+to+hide+id+on+android PDF link annotation
    • http://ellev.fr/upload/files/bilipavelirin.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210912222256_mgueot.pdfIn PDF document text
    • https://euronet.stonavka.cz/webpagebuilder/ckfinder/userfiles/files/ginalik.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/10845844398.pdfIn PDF document text
    • http://evola.it/userfiles/files/12354997558.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613158c661575---vojigixetosetofusexo.pdfIn PDF document text
    • http://khojedu.net/userfiles/file/40411627791.pdfIn PDF document text
    • http://allasclub.com/campannas/file/58218222344.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/xuxodef.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/lagiwisariwamopafekodezu.pdfIn PDF document text
    • http://tfforming.ru/d/files/zarokefetit.pdfIn PDF document text
    • http://www.ap-arte.ro/fckupload/file/fumelixusadiril.pdfIn PDF document text
    • http://apartament-krokus.pl/userfiles/file/witubedozugutabiwepa.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///pudunixelizokodozutin.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/70190282039.pdfIn PDF document text
    • http://inphilong.com/upload/files/56273685528.pdfIn PDF document text
    • http://ankaraeksioglu.com/resimler/files/68204358718.pdfIn PDF document text
    • http://www.anaja-inter.org/public/file/22689699650.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/josabegokojidepifisunaj.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/nejezuvoz.pdfIn PDF document text
    • http://chickendaylacrescenta.com/uploads/files/98931949781.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/74383586505.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/19588520259.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/mafebifu.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/bosagibigotojevi.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_off0000b544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB544 15580 bytes
SHA-256: 813ddf9750b8244095d8ffdfb584993f024c684da08ef648b4979ca3406ca155
font_01_sfnt_off0000dce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE0 10208 bytes
SHA-256: ebc14e44f3101f4c88bdb1730bf52d45629e9846c4fc009b70185877f1e089c0
font_02_sfnt_off0000f3b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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