Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c61d1063ec2b29…

MALICIOUS

PDF

86.2 KB Created: 2021-09-09 12:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 48137d83403adad759fefb23c29eeeb1 SHA-1: 4d7612765432dc3dc1b40318748b3eb09b357a92 SHA-256: 40c61d1063ec2b29a3b45cd471dba0597c23a79e5ac1407d7662056ed683e86a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by 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 0.9974

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 http://findusafranchise.com/files/files/gixakotiwuz.pdf In PDF document text
    • http://izeninfo.net/admin/upload/files/45140945927.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/xazuk.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/xawoxaberelunixovabupoj.pdfIn PDF document text
    • https://powermailer.in/userfiles/file/gopomuneke.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210909163046128.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/xivarafafewewazadexaw.pdfIn PDF document text
    • https://xtrafitcoaching.com/www/images/files/gabosorixukukikizad.pdfIn PDF document text
    • http://vetusmeter.com/images/upload/File/43900422299.pdfIn PDF document text
    • http://asid.rw/userfiles/file/66442449670.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/kujogiwesapivevenodi.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/83701969861.pdfIn PDF document text
    • https://nedimgame.net/calisma2/files/uploads/boxonakona.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/77716461769.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/butigesenuva.pdfIn PDF document text
    • http://chenruichem.com/upload/files/fixodibitivo.pdfIn PDF document text
    • https://castel.ro/userfiles/file/95321941073.pdfIn PDF document text
    • https://clickbox.ro/images/file/84847754696.pdfIn PDF document text
    • https://yaslibakicisi.net/userfiles/file/45316135022.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/83688405582.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/61502202135.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210903135952.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/17215637694.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/dedalapuwutusa.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/kopiromikef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=wifi+network+not+showing+up+on+android+phonePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE91A 11000 bytes
SHA-256: fff3a8ff2a4178ec18876063e432215e22527fe2e78b07faa506053326caed2f
font_01_sfnt_off00010284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10284 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A96 18288 bytes
SHA-256: 94f0d420bdf76f2dacd39b37da825a87c0a69952182113f258183d87fc09070d

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