Malicious PDF — malware analysis report

Static analysis result for SHA-256 d475d07b49097604…

MALICIOUS

PDF

53.4 KB Created: 2021-09-25 19:07:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1c2f3ece44406993ae66a0a0feb8269 SHA-1: f35e28498d4bfc1bf66c5708ef26bedc4d78f71f SHA-256: d475d07b4909760475ffcd5fe5f4570bf40dbd541e0415e81dec78a070a5ee63
124 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm. The primary function seems to be redirecting users to potentially malicious external sites, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8539

Heuristics 4

  • 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
  • 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://huntic.ru/uplcv?utm_term=lettore+xvid+per+android PDF link annotation
    • http://ahzgbh.news-read.com/upload/files/vixejuzunatuzegimepop.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/lomajezumaludes.pdfIn PDF document text
    • https://maria-galland.ru/files/file/70799215215.pdfIn PDF document text
    • http://e-sportis.com/images/upload/tagorelamuxegufujur.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/8353454433.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/1911042623.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/86548282621.pdfIn PDF document text
    • http://mrhobbscoffee.com/images/uploads/file/55523227227.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/tuxikijuzizugutazoserew.pdfIn PDF document text
    • http://hrudolf.com/userfiles/79698671886.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/silobovaw.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/werejupudojipowifekudaval.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/16613745683.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/xotagavagatorasuv.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/kotewuzozunaseb.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d6bd044ae6---31693539145.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-8/20210908105313200908.pdfIn PDF document text
    • https://novitas.ro/files/62474123408.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aa2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAA2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1