Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0636b78f020ef4f…

MALICIOUS

PDF

80.1 KB Created: 2021-09-12 15:04:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 380b4f0affbfbfa07b275d0029ec85a2 SHA-1: f8d3dd2c3de26790c5321db932cce99887565fed SHA-256: d0636b78f020ef4fc7c93867c5fdb4f87dccaab07672f8ce3032b888c0eed612
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external domains, many of which are structured as PDF files, suggesting a phishing or redirection scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://infrive.ru/uplcv?utm_term=convert+xlsx+file+to+pdf+online+free PDF link annotation
    • http://cana.vn/uploads/userfiles/file/fadikimetegunase.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/18027579602.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/mugozovewojogazorilodotof.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/22716576180.pdfIn PDF document text
    • http://abwlondonblvd.com/uploads/files/30092842562.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/zedufirujezopekojegepaver.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/30187881048.pdfIn PDF document text
    • http://hyosangjo.com/userfiles/file/20210908230130.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/48787383600.pdfIn PDF document text
    • http://duz-drustvo.si/uporabnik/file/mezezumekuxu.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/fasojigemoj.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/buzamomag.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/12683297100.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393d90d2ad8---63057223937.pdfIn PDF document text
    • http://101eyewear.com/luutru/files/91937847455.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/24726591651.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/67166148897.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/djspn9o0o6t2eld8o2kqpp87j0/xafetozojopawufad.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/metelaziluvuzuvibu.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/36679101199.pdfIn PDF document text
    • https://photojet.net/userfiles/file/sinafenokagiferowepavuxim.pdfIn PDF document text
    • https://salonrewards.ca/images/file/94956285293.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/tirutesu.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/wopuxokobap.pdfIn PDF document text
    • https://dom4m.com/userfiles/files/74263279124.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_off0000d66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD66F 10528 bytes
SHA-256: 77cbd43ccbf72d4bc5addf9dc790ab90f04e9b1ee483d30fc9a929d021ff54f6
font_01_sfnt_off0000ee96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A8 17056 bytes
SHA-256: 4c902c37849c9ddd157c75969cd2ff6b15f05a8eed202e69967fe0df2084ce3d