Malicious PDF — malware analysis report

Static analysis result for SHA-256 5311800b1138c0a6…

MALICIOUS

PDF

74.5 KB Created: 2021-09-22 09:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 385053b7f29750a3b1c058415e87d43a SHA-1: f501d78ecf267174e794f50fd800bb83e3294fcf SHA-256: 5311800b1138c0a60a5116ee496898e526b7b3e682fc6533e40f921cef514c5e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to lead users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://irlanc.ru/uplcv?utm_term=ldplayer+playstation+app PDF link annotation
    • http://vedepcuaem.com/luutru/files/98300899625.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/46539008448.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/11461711203.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/bokexuzojojuzefe.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/natog.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/67456783976.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/oink7mhve911bk5ic8ii2itcsc/fazaroki.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161357ca57b2c1---vebemodijigitutoke.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/fejopur.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/lavagazisedo.pdfIn PDF document text
    • http://contua.org/userfiles/file/danikirojuxaxobeva.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/16704882752.pdfIn PDF document text
    • https://theptaynam.vn/upload/files/81342189921.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/77583858141.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/wekowuwi.pdfIn PDF document text
    • https://tuinvandecruys.be/file/85929406491.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/59058034796.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/41445890003.pdfIn PDF document text
    • https://trainova.com/userfiles/file/mizexidazev.pdfIn PDF document text
    • https://medicentrumnz.eu/medicentrum/files/file/gaforepetevakuvawejev.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/62984610981.pdfIn PDF document text
    • https://kham.vn/userfiles/file/75396873522.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/59761871566.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/lebikubovekixuga.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_off0000c199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC199 10456 bytes
SHA-256: 5e157ec623e60e1be3add4209664556b949c78b9ea2b7becb079a0a8f7670155
font_01_sfnt_off0000d977.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD977 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF189 16576 bytes
SHA-256: fcd65bd66fe37dc22312b5e5f014adc4a5fff468e681ebde49969b4519364c3c

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