Malicious PDF — malware analysis report

Static analysis result for SHA-256 803d98df7c122eb8…

MALICIOUS

PDF

77.8 KB Created: 2021-09-12 21:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4085e126f16f48f5b6f46c20f5865d8c SHA-1: 8b6948839409e7373c7db9f147027edb98f70b24 SHA-256: 803d98df7c122eb81a77f12e675a870b0cedf85e83d71fc42cd4dff9bb087eac
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier strongly indicates maliciousness. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect users to potentially malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 4

  • 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://coretry.ru/uplcv?utm_term=pubg+mobile+lite+god+mod+apk PDF link annotation
    • http://menifee.hanasushichoice.com/uploads/files/xuzogipoluzamatezimobidef.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/vafog.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/69950729867.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/88180213511.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/32713021001.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/venowu.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/vukikanurifixixafizepin.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/63355380283.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/kikolulow.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/dasigafo.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/lejitun.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/42040421898.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613a532c2daa4---jozamasazovoniveni.pdfIn PDF document text
    • http://uniontsg96.ru/admin/ckfinder/userfiles/files/dusamedewowali.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613baee857cca---dakogetiwa.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/gexufaxit.pdfIn PDF document text
    • http://pietrek.com/MARCUS/files/file/30979449289.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/39898012423.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/92026288790.pdfIn PDF document text
    • http://hflchw.com/upload/file/12767854978.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210908_4B700ADEB517116F.pdfIn PDF document text
    • http://palami.by/images/file/birinulaluv.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/ropemilafupaja.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/fuzerazuduxedipepo.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_off0000c2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2CD 10696 bytes
SHA-256: d4c7b106663e78ab8744d3c46320043a3e163ba30def97ebdccb3a6cc456a68e
font_01_sfnt_off0000dae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE5 20364 bytes
SHA-256: db44b03b5a7ab2e3f497293c6e69307a2d56ddb3a61caae823d8b07ff7835e85
font_02_sfnt_off00011047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11047 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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