Malicious PDF — malware analysis report

Static analysis result for SHA-256 745cd4c7536adfd4…

MALICIOUS

PDF

79.7 KB Created: 2021-09-09 13:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 053d49278011ad17675f8d7e75bf6dc3 SHA-1: ae917a6251cff7d3edf09773ea29d51a2934820f SHA-256: 745cd4c7536adfd470bc9e8d4e21adde010ff33cbd69827f990e99679ed22fa9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://glovimex.com/uploads/ckfinder/files/sobonesibixagutar.pdf In PDF document text
    • http://ahxxzx.com/userfiles/202109/file/55303410629.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/24971712535.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/42118149055.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/82347865569.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/sukebanoga.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/wazukorukadem.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/filudepegoku.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/ledisobigugok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=5e+princes+of+the+apocalypse+pdfPDF 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_off0000d1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A2 10868 bytes
SHA-256: ff99126b2436cb55fbab3d4ac1524aab608c2161d7f15f3303ed742ccf1bd7a2
font_01_sfnt_off0000eab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 18024 bytes
SHA-256: 590e9dbe6ee83fc8592673a1ea1ce297aed9d0e1859e67313e8552e0b8b14229