Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cb0522325c22a92…

MALICIOUS

PDF

83.3 KB Created: 2021-09-18 06:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1336847418e380d742783c30bf4c8349 SHA-1: 3a97eeb3306ecfe91421c8dc6760bc3539005319 SHA-256: 8cb0522325c22a9263abf414a4fceb3cce3da2e50c694496b0e092c4f25f82c6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious actions within PDFs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of external links, suggesting a phishing or spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://saintarseny.ca/sites/saintarseny.ca/files/file/53741683548.pdf In PDF document text
    • https://xn--espaoldetalca-lkb.cl/var/www/html/upload/file/tanukogatap.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/68956619002.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/sazevedonajunobajivo.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/ferujexeluvev.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/jexopomobawitezokaruraduj.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16136030e19b35---widebobi.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/66094661645.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/65273198388.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/kubazanedupozejozedizosed.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/74221888190.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/7974059515.pdfIn PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/fatakigore.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/98055225056.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/benopigolugerezonukuwu.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/94854793316.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/1765663966.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/71899851782.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/nesiwevopidu.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/92328389657.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/betadugiku.pdfIn PDF document text
    • https://recapress.com/ckfinder/userfiles/files/30452956605.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=digimon+rearise+mod+apkPDF 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_off0000d83b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83B 10684 bytes
SHA-256: 9afad67c10ea00802396b4032c9d5f655f0ad91a943ce39ae7665776f2a39332
font_01_sfnt_off0000f071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF071 21292 bytes
SHA-256: 2188a3439be20823dc213c68ccdd1534569a0b14dda6a7445d1a002fda609d9d
font_02_sfnt_off000127f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1