Malicious PDF — malware analysis report

Static analysis result for SHA-256 f23caa493513ce6a…

MALICIOUS

PDF

87.8 KB Created: 2021-09-19 15:03:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0ee056728659881e8bc67e149d2b523c SHA-1: 4571d89b48c7a9cc2f55b64dbf14ed3da5160798 SHA-256: f23caa493513ce6a957649c463925cf7b3465e7a08ffdca7ea72472c4e7167fa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the PDF is part of a network of sites designed to host malicious files or phishing pages. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://irlanc.ru/uplcv?utm_term=i+will+lisa+kleypas+pdf PDF link annotation
    • http://lovepetclinics.com/file_media/file_image/file/94627479327.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/7122826467.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/wojazabi.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/ziterajetawu.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/nixorarirejokaji.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/dopurigi.pdfIn PDF document text
    • https://ecoolteh.eu/galeria/file/21047963962.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/33889413361.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/woforubej.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/4175f492f168b2fc43e37372fffea8da/jinejuwin.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/32120395703.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132743a944b3---68919100079.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/4339734510.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/12258307071.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/tesizinubutosawuvuvopodo.pdfIn PDF document text
    • https://xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/goluwu.pdfIn PDF document text
    • https://autoskola-scp.com/files/25244281332.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/35552357652.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/74833092115.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/gixirumumegewesurareke.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/79088301889.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_off0000f39e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39E 17876 bytes
SHA-256: 4b814820022a6462fec88699cd7b4028edc4ed1088fbff9dde30594db15e9271
font_01_sfnt_off00012203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12203 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A1A 10312 bytes
SHA-256: db010d8fb62b74b83feb5a8c5800b363832a2f80b10578744378390d7ab05d1b

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