Malicious PDF — malware analysis report

Static analysis result for SHA-256 b68a38a95c83cd0e…

MALICIOUS

PDF

74.2 KB Created: 2021-09-19 03:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3023bb67f5db3e9b17f4099f91a4588c SHA-1: cecb60ef4e0fbe1cce65aa2d67626878356a6c69 SHA-256: b68a38a95c83cd0e3559940d9eba261d4785e13777eada954c5a7cc9c4ce93ff
166 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'SE_REMOTE_SUPPORT_LURE' suggests the document attempts to trick users into installing remote support tools, a common phishing tactic. The PDF also functions as a link farm, directing users to numerous other PDF files hosted on potentially disposable domains, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://sk4education.com/ckfinder/userfiles/files/5410094459.pdf In PDF document text
    • https://larustt.com/upload/ckfinder/files/3432070260.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/55236945064.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/penilefepegew.pdfIn PDF document text
    • http://mottaing.eu/userfiles/files/73922718316.pdfIn PDF document text
    • http://chanakyaaerospacedefence.com/userfiles/file/49496291664.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/11093760345.pdfIn PDF document text
    • https://songhong.info/userfiles/file/52166105998.pdfIn PDF document text
    • https://badrivishal.com/media/megulovogabijolizujipamip.pdfIn PDF document text
    • http://vrieshorst.nl/images/uploads/file/74151529510.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345dd3951a2---vetozo.pdfIn PDF document text
    • http://artetendasud.it/userfiles/files/27374966472.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/10965746296.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/saxugexovifakifimafu.pdfIn PDF document text
    • https://icnj.net/ckeditor/ckfinder/userfiles/files/mubuzuxidetutixipun.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/disunite.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/76343645640.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/69239329747.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/26231701560.pdfIn PDF document text
    • http://aibasylhet.edu.bd/app/webroot/ckfinder/userfiles/files/71731003308.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/82915035399.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=android+tv+screen+mirroring+appPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFC2 16532 bytes
SHA-256: e682548f4d7b41d45e270f3f7b814f047ecddf99d19dfa9a89753b8bd224a1e7
font_01_sfnt_off0000ea62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA62 10856 bytes
SHA-256: a510a4d4cf1b9fc5fddea7b8faf41860463319f149ffb9cda61dddb7b3c0a5d6
font_02_sfnt_off00010352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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