Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d929978aeaf12d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 15:25:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 39ea24bc1e810e87c2c15fbcdd8ea63a SHA-1: a651b944bf828012514fbf764127a1da49f6d495 SHA-256: c3d929978aeaf12d34e672e3bbb17d0b5599709ec409cb8d307f3be6b59150f2
126 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially compromised or malicious domains, suggesting it functions as a link farm or redirection mechanism. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://studiolegaletrotta.eu/userfiles/files/tasinibufutoduwaka.pdf In PDF document text
    • https://airin.lv/images/userfiles/file/peduk.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/66148749290.pdfIn PDF document text
    • http://sakaryakasaplarodasi.org/userfiles/file/81928311867.pdfIn PDF document text
    • https://indiansecuritisation.com/ckfinder/userfiles/files/vegefab.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/sorinaxibewofod.pdfIn PDF document text
    • http://prepearl.com/uploadsfile/lokomirobelinibobuzesugor.pdfIn PDF document text
    • http://ebus.cn/up_file/file/85700654732.pdfIn PDF document text
    • http://hatdesechia.com/storage/ckfinder/files/revubitelaregenoseponukev.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/seposobidaranepewava.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/73sggbm14vak67edh6i5u0ni04/gusafulabago.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/74944830262.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/50822115731.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/jawifazapas.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/42683368977.pdfIn PDF document text
    • http://horvathortho.hu/tmp/daposukudakijeb.pdfIn PDF document text
    • http://xn--80akoseq9f.xn--p1ai/userfiles/file/vadalidonurumapuwuwulutu.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/12985809517.pdfIn PDF document text
    • http://sial.pl/galeria/file/91523132008.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/75174187974.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/11317222772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ios+chrome+pwa+add+to+home+screenPDF link annotation
    • 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_off0000df83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f79a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79A 10680 bytes
SHA-256: 3881bf49bd0b78fb51fb538451a594e8841869ab26127b0e26091c269862d263
font_02_sfnt_off00010ffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFC 18888 bytes
SHA-256: 5700fbcb95c8b85134b56564dda5a84f0709304bccd95a4b476164972fef1c4b

Open this report in the interactive analyzer, or submit your own file for analysis.