Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8b48e6b82f5ae3…

MALICIOUS

PDF

68.4 KB Created: 2021-09-24 18:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dec345491eb5ff8ad682576e367921ef SHA-1: b6d9c12604f00a16c9dc4070dbf53fce571ffdf8 SHA-256: 0c8b48e6b82f5ae31d5080ead5c0b7fceb6e022499517855d382c2186f4e6365
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to what appears to be a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic further supports this, indicating a deliberate attempt to obscure the true destination. While no scripts were directly extracted, the nature of the embedded links suggests a potential for further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/25849861931.pdf In PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/90228093536.pdfIn PDF document text
    • https://promise-land.com/upload/file/43182776710.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/34342896389.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aed248c698---99795196980.pdfIn PDF document text
    • https://onlinendttraining.com/files/tafefirozodolinakoz.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/nopunod.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/tilajen.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/furiwipolutu.pdfIn PDF document text
    • http://lawyersmarketingusa.com/user_upload_image/file/In PDF document text
    • http://elhammagazine.com/ckfinder/userfiles/files/tavonupupuz.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/70952021042.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1632324993.pdfIn PDF document text
    • https://kaptenhoki.org/contents/files/bobabugaxaloje.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/87511797632.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/93334244743.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/67412045242.pdfIn PDF document text
    • https://pellevah.com/upload/files/wurimufetedidosuzelum.pdfIn PDF document text
    • https://www.aicsmindia.org/ckfinder/userfiles/files/89203292737.pdfIn PDF document text
    • http://caythuocnam.org/images/files/koduvimigux.pdfIn PDF document text
    • https://artedelvalle.cl/gal/files/file/79334587879.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=connect+ps4+controller+androidPDF 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_off0000ac68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC68 10616 bytes
SHA-256: e47409610006f0db869d5ad2dc90833c29798cbd2f7dd0098c88330c6ed0b894
font_01_sfnt_off0000c4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dcea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEA 15568 bytes
SHA-256: dab6b08affb89c8844c7664062a32999568420b068c43ac54d06c47c4b3ce308