Malicious PDF — malware analysis report

Static analysis result for SHA-256 13763e08ce8e4463…

MALICIOUS

PDF

80.4 KB Created: 2021-09-17 20:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3c250860c7faa8f736913741f00252df SHA-1: 6373d25592d688f2848a0a33d47ac072846edb36 SHA-256: 13763e08ce8e4463e67138b8f75df8d6236b973be94980f6be5aa505f237d613
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to function as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and the ML classifier strongly flagged this PDF as malicious. The primary URL suggests a lure related to downloading games, likely a pretext to redirect users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pixomot.ru/uplcv?utm_term=app+to+download+games+on+pc PDF link annotation
    • https://beautydiction.com/ckfinder/userfiles/files/28402601609.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4d95e24ea16250840df99cc2d7aa8969/92060912908.pdfIn PDF document text
    • http://jindi2010.com/uploadfile/files/gipuvipo.pdfIn PDF document text
    • http://preprod-proximeo.com/ckfinder/userfiles/files/9630896782.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/xogufipapipifiv.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/kufunasovodewejabomitik.pdfIn PDF document text
    • http://dailyxedayhang.com/userfiles/files/57694512291.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/39731607826.pdfIn PDF document text
    • http://kesherisrael.com/uploadEditor/files/xibijemajofo.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/16232618828.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/86535264491.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/43979413920.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/koxifuki.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/bavufiniket.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/76331657560.pdfIn PDF document text
    • http://lepetitjaunais.com/userfiles/file/sikatokiwik.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/69890503247.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/tukivarine.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/ruzefuxemunenutipumawa.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/wexulakukitoronetake.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_off0000d6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BB 10732 bytes
SHA-256: c26998c27976d2df27dbb4684b26a52d0246a4ef51f7d54dff1d959b81e39281
font_01_sfnt_off0000ef53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 17528 bytes
SHA-256: 9ab7fc994ec577db4e7a3451bb1e7380482642a401a01cef2cea8e660ec39663
font_02_sfnt_off00011c3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.