Malicious PDF — malware analysis report

Static analysis result for SHA-256 313c50bfa70fbaa7…

MALICIOUS

PDF

82.1 KB Created: 2021-09-21 03:36:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3ac8b548f7efa2c4077014b72e7c8ef8 SHA-1: 10bedbbb2afb7c2c6fc724726a80fdaf4833bf8e SHA-256: 313c50bfa70fbaa7e1775071fbce2d62bfccb3e91d51137160e1eae3a55e5dbe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains embedded JavaScript and a large number of external URIs pointing to disposable domains, indicating a phishing or link-farming attack. The PDF structure and embedded JS suggest an attempt to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://yousefmaktabi.com/ckfinder/userfiles/files/lafifesose.pdf In PDF document text
    • http://klientskazona.radeton.sk/ckfinder/userfiles/files/gifizibavexunupafe.pdfIn PDF document text
    • http://wirheiraten.de/images/file/gaduvaxinedazafawopen.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/wigobefodivagoxurikub.pdfIn PDF document text
    • http://oticonshop.com/ckfinder/userfiles/files/25785772500.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/7533366516.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/98155908847.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/90189807301.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423d72c55ce---59629011533.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/xozakibenunabup.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/laxozopanes.pdfIn PDF document text
    • https://biharlokmanch.org/userfiles/file/11737872088.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/3a235d628bbc3113a64b774f247c86f6/vokosax.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/ziwotapazonudefipurozaj.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/vavedaragizoxufin.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/jajivakewavawogiras.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/garuvemirutosuj.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210913_0B26E8E8A4B1A931.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/18203019409.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/fazufeli.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/64385463618.pdfIn PDF document text
    • https://nevisnews.com/userfiles/vapemobewasilufo.pdfIn PDF document text
    • http://infiniti.e-library.tw/uploads/files/nevagigadafolozaleziroget.pdfIn PDF document text
    • http://atomleasing.ru/media/File/91739442566.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210914122926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=organic+chemistry+1+reactions+cheat+sheetPDF 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_off0000d9d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F0 10820 bytes
SHA-256: bde561fbbc3bdb3eae21a27cb5afa2a2d3871cddce4d87ef325963798873b6bd
font_02_sfnt_off00010ada.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADA 18236 bytes
SHA-256: b7fbe32c35b73ca9c97781166f35c2d215da6abc644fdab9f6087200e9ef6968