Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c77e9b0296af4b…

MALICIOUS

PDF

79.4 KB Created: 2021-09-23 10:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c195ad35049c5776c7582f7a0c1e1e45 SHA-1: 44745e100355836a5f1210454ec8aa87b5a31971 SHA-256: d2c77e9b0296af4ba9bc29a578aa1146baac605ec20206c5e01fcdbfbe3ae580
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting and appear to form a link farm, suggesting a phishing or redirection scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall structure strongly suggest an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614c1703b35d0---4210451294.pdf In PDF document text
    • http://onnetsolution.in/userfiles/file/30940013276.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210905_085608.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/39990827312.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///4454575659.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/3b646f92c8878a3aa7461251e3104b25/govoseliru.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/29710052713.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/kosowozola.pdfIn PDF document text
    • https://alkirbilaw.com/userfiles/files/zasilolajeki.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/83588222825.pdfIn PDF document text
    • http://compow.net/ckfinder/userfiles/files/zitepedas.pdfIn PDF document text
    • http://www.ambatownship.com/ckfinder/userfiles/files/mibafid.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/63980853643.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/71938031660.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/wokuzuvo.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/mutur.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/34669000626.pdfIn PDF document text
    • http://chinahongji.com/d/files/54595668716.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/562159741.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/66120596445.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/66441180437.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/57357657356.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/xagagudipiberatag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=unlock+home+screen+on+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_off0000d153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD153 17908 bytes
SHA-256: 05d63cb28943b087657c7a255c73dcfb5a168e4f5af0384cbe10d3624aa0e35d
font_01_sfnt_off0001000e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000E 10636 bytes
SHA-256: 974065d7fb541d954326e499ea6f018614a08488f979d667a92184ebb989f3e1
font_02_sfnt_off00011823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11823 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1