Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ec1e60c61fa5d7c…

MALICIOUS

PDF

80.1 KB Created: 2021-09-11 00:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: b6f6be34d2a2c6b4d1b55ebc672c639f SHA-1: 78aa15916b0f65f9a277c1241935fc5f15fcce9f SHA-256: 0ec1e60c61fa5d7c497e66c90ac06ff576f75a475ad2399ef5cf143ff3d4999e
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, with a critical ClamAV detection and a high ML score indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's purpose is to direct users to a network of disposable hosting sites, likely for phishing or scamming purposes. The embedded JavaScript is likely used to facilitate redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://samnakthodrahassob.com/userfiles/file/99248188213.pdf In PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/4907241763.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/92883272326.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/bugofik.pdfIn PDF document text
    • http://plovdivweek.com/app/templates/js/ckfinder/userfiles/files/barala.pdfIn PDF document text
    • https://loyalangkorapartment.com/userfiles/file/dunusu.pdfIn PDF document text
    • http://cssh.es/img/file/zumusorimulojef.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/22363061296.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/vuveruvijopuxixalaju.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/5832390672.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/53822468707.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/8b2655819a73266311ae3e509a626550/97024709311.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/ranixowupum.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/46693995238.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/20639425208.pdfIn PDF document text
    • https://hsse.cl/files/90804723685.pdfIn PDF document text
    • https://remoteyourstaff.com/calisma2/files/uploads/50601505151.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/fulamipuponuvurusa.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/mesaxu.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/jowewexekam.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/1886333105.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b112ebee92---40383275783.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/89210536839.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/jodaxuruxivagewuw.pdfIn PDF document text
    • http://theponghop.com/upload/files/repojifulimew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=before+midnight+full+movie+online+freePDF 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_off0000d61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD61C 10688 bytes
SHA-256: a082d559784ecdfd9addbac52e47be2a6841ce3de43f90ddadd4335b84344b6d
font_01_sfnt_off0000ee2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2B 17416 bytes
SHA-256: 31b6fc43390926819ae5f2a9f30c290f45a799868ad33e1efeadcc09ee691ada
font_02_sfnt_off00011ae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1