Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7441f7003026ff…

MALICIOUS

PDF

66.9 KB Created: 2021-09-19 08:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc1d4f2c94d16fdeabae199b436e7500 SHA-1: c0ae7c00ed63467e86183f24316f7c6b61ad37b8 SHA-256: 6c7441f7003026ff25e062cde28c3aac168302eba3ef7bbbc15fef7b9b1f3a7e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was identified as malicious by ClamAV and an ML classifier, with high confidence. It contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, suggesting a link farm designed to redirect users. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate further malicious actions such as downloading a second-stage payload or redirecting to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=d%26d+5e+auto+calculating+fillable+character+sheet PDF link annotation
    • https://intekcanada.com/ckfinder/userfiles/files/vamur.pdfIn PDF document text
    • http://equalitas.es/userfiles/file/52031257780.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/96388890905.pdfIn PDF document text
    • https://testpensija.bankai.lv/ckfinder/userfiles/files/72477115977.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/30681531250.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/gejarovexonoxivapofagoz.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/darokezetifonup.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/pibonomadizidafopali.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/fupamigide.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/gamezefewuzitubomata.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/10163577417.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/54856212873.pdfIn PDF document text
    • https://avenue102.com/uploads/file/pokewevi.pdfIn PDF document text
    • http://tomaszskiba.com/userfiles/file/25075384135.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/86752791120.pdfIn PDF document text
    • http://landroverbh.com/ckfinder/userfiles/files/17578339815.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/nojowokawojuwake.pdfIn PDF document text
    • http://freewest.at/36741177651.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/simatejaxiwam.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/13039796355.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/99175815866.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/lexof.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/67992719393.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_off0000b011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB011 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_01_sfnt_off0000c2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC8 14232 bytes
SHA-256: a85a0a678558b77db43330d5ce16bc5571c06c23011ec78e087bbc371e7e39a1

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