Malicious PDF — malware analysis report

Static analysis result for SHA-256 861cde5d67dbb45e…

MALICIOUS

PDF

68.7 KB Created: 2021-10-04 10:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b0ee088c15dceb2acbdd5b58e317af2e SHA-1: b8040e355aab1c9169dcb6ee409c024d38f98176 SHA-256: 861cde5d67dbb45eb8347e248700e292aefb787b7ed10a405b42f43b54dcba25
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://wanfutemple.urwaydesign.com/data/file/userfiles/files/23933714908.pdf In PDF document text
    • http://knuhpharm.kr/userfiles/file/20210924033101.pdfIn PDF document text
    • https://cope.lk/assets/media/file/zatalakivozevevepilogibek.pdfIn PDF document text
    • https://keralahappyjourney.com/ckfinder/userfiles/files/javinilakev.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/balepitedafukubamokipudak.pdfIn PDF document text
    • https://kingdom.vn/userfiles/file/fobewajetuziwizi.pdfIn PDF document text
    • http://jlicentral.com/images/authors/file/xolizigajelatetogux.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/zunerekupilibizuw.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/76573209848.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/seduwilasisofixobegabom.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/fipuviva.pdfIn PDF document text
    • http://mindennapi.hu/upload/file/24329861760.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/fumojonanizowakimiwe.pdfIn PDF document text
    • http://studiogiamberardino.it/userfiles/files/mivuvazumur.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/pt1cudkqb2e1c2t0pah37jfjnf/9342389284.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/30752110030.pdfIn PDF document text
    • https://fontan-montag.ru/img/upload/28250536973.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210922_7C85765E257F97BC.pdfIn PDF document text
    • http://amdind.com/userfiles/file/kokajuratizimek.pdfIn PDF document text
    • http://skupka54.ru/upload/m/velejojatemidop.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/bisid.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/gexojisijevenulaj.pdfIn PDF document text
    • http://hwangtosidae.com/userData/ebizro_board/file/nefelidobiroku.pdfIn PDF document text
    • https://ecpa.fr/uploaded/file/56114568436.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=93rd+oscars+nominationsPDF 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_off0000af83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF83 10596 bytes
SHA-256: 63c413802f7acbf3c26ba785e5e82b154602c0d970c9e92efd8cd63407bdbdb6
font_01_sfnt_off0000c7ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AE 14968 bytes
SHA-256: f13d927bb4ebcf8af3563b053aade3b29ecccd5dca9de8797da24c1fb25ae5e8
font_02_sfnt_off0000ed89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1