Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3fb5df0b8f53bd7…

MALICIOUS

PDF

68.9 KB Created: 2021-09-14 05:29:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 07a8c0e192a456a8570c223595f63b2e SHA-1: 10390b99b4b10a9bf80fe20db47cfc6e6d0316f3 SHA-256: f3fb5df0b8f53bd78397ead015742a5f30909a02649ade1835e34062c2c6c39e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm designed to redirect users to download sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution disguised as game downloads. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://chcial.ru/uplcv?utm_term=download+game+underground+2+android+apk PDF link annotation
    • http://ortopediaszombathely.hu/editor_up/xiposizufo.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/bugixo.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/20171729005.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/zisuju.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/zalapikogofixigolitofig.pdfIn PDF document text
    • http://laarakkers.com/ckfinder/userfiles/files/tegusa.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/94579576692.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/6500799356.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/80684021375.pdfIn PDF document text
    • http://fijiembajak.com/uploads/ck_uploads/files/pozidu.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/2826920099.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/83035579519.pdfIn PDF document text
    • http://c-amc.com/upload/files/feroxakoregetotazegawaxem.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/71313184717.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/bapemumo.pdfIn PDF document text
    • http://tchid.net/userfiles/file/vegosonexaw.pdfIn PDF document text
    • https://almavilag.hu/files/files/15001171988.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/25696213586.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/sirigo.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/38197133101.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/24f5768a482e01ab041b7ea2cae487fd/xuzuredulijexajuve.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/92693414281.pdfIn PDF document text
    • http://cartopack.be/Images/file/77806668068.pdfIn PDF document text
    • https://egca.fr/userfiles/file/20087178277.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/94506508938.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_off0000b085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB085 14564 bytes
SHA-256: ae8593d9a17251b40a6ceb39b6b137b2943b488692edb3e4e035545d522d7a9d
font_01_sfnt_off0000d4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4F1 10868 bytes
SHA-256: d3672b6e6e611a544ab10f035ac029b3c42703b3ab43dc80c8ab34c64776aa75
font_02_sfnt_off0000edde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1