Malicious PDF — malware analysis report

Static analysis result for SHA-256 b02323646a5682ee…

MALICIOUS

PDF

81.8 KB Created: 2021-09-14 12:01:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a5bef8c5acee45bc1093036cd88aa786 SHA-1: b9f2d5817c74f692b1369085a5b066ffe00f4b4c SHA-256: b02323646a5682eef60025f6af9765a2e4cfe9ae358092a05911193b5b638a64
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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.
  • 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://crysiq.ru/uplcv?utm_term=easy+death+run+fortnite PDF link annotation
    • http://4chan.ro/UserFiles/file/xisumu.pdfIn PDF document text
    • http://innobiztour.com/FileData/ckfinder/files/20210903_3C6E1E2E58BB5BDF.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/62668383545.pdfIn PDF document text
    • http://phone-server.com/userfiles/file/bulexixodidejivamiwuwejuj.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed1545e163---62007798929.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-8/20210908025008522331.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/95962300156.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/vimejodugoxigi.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/1529842509.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/pijupawepujanexu.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/57059136140.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/99600349678.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/8791099621.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/56192037279.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/nemerimumonisavebofora.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/28633245273.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/23931556431.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/popoferolawavugusobaji.pdfIn PDF document text
    • http://patp1ryb.ru/media/file/subugegape.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/15327712649.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/19464546695.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/69440133821.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/10311515573.pdfIn PDF document text
    • https://terminarz.online/kosmetyczka/krakow/files/55800847763.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/rizelisuwutebezile.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_off0000db97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB97 10604 bytes
SHA-256: 4d3240d3794c5d2fbfe73c96aaccc580ad987cf1d142d4f0578469f92841236a
font_01_sfnt_off0000f3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C9 17504 bytes
SHA-256: 4eb336cb7617c5264e0f281425b084bbdea8820670878b9ae2d9bee1edbd4019
font_02_sfnt_off00012198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12198 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1