Malicious PDF — malware analysis report

Static analysis result for SHA-256 f04aca77d0ce9a15…

MALICIOUS

PDF

69.1 KB Created: 2021-09-30 18:31:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4bf4178ce6f331dc0510a288839b5bb4 SHA-1: b751c9eddc68bc9890ee1c9d094076fe7ee7148e SHA-256: f04aca77d0ce9a154176c65a5723e301c408564dc7a3f5d501c6ce5a19fe04ca
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious content. The heuristics identified the document as a link farm on disposable hosting, containing numerous embedded URLs pointing to potentially malicious domains. The primary attack pattern involves luring users to these external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://wastran.ru/uplcv?utm_term=volume+of+prisms+and+pyramids+worksheet+answer+key PDF link annotation
    • https://equimat-cheval.fr/file/12434115945.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/13523168007.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/fakudadufumusegegewuv.pdfIn PDF document text
    • http://www.louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/fojinemamaxagaleg.pdfIn PDF document text
    • http://12shio5.com/contents/files/sofem.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/kezedewi.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/fotenabusegofakejetizu.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/lazezotezegeduwonanozek.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/fowutezixuwujarogadoporo.pdfIn PDF document text
    • http://lltsg.com/uploadfile/file///2021092007531598.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/2026156647.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021091821294373499.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/jawepadim.pdfIn PDF document text
    • https://libyamonitor.com/sites/all/libraries/ckfinder/userfiles/files/vesafazide.pdfIn PDF document text
    • http://markfarolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/66048604830.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b9a6955e2---fesati.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/63660864618.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/92372091870.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/zivitixoloxuxuvevu.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/71543881618.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/40052843080.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/70612665012.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417efd2e8df---61817089063.pdfIn PDF document text
    • 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_off0000ae85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE85 15000 bytes
SHA-256: 81ff3f5a937e5b357c9de11485d46481337e55974c4824ebf10a8efcb98ce4ea
font_01_sfnt_off0000d493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAA 11124 bytes
SHA-256: f8ed28143cbfd2b07f7e3b4bd58ef7f71ed402970003bdbe337e08653a662644