Malicious PDF — malware analysis report

Static analysis result for SHA-256 69b2181a1ad1056c…

MALICIOUS

PDF

94.2 KB Created: 2021-09-23 20:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 1e24b1267a64744e7a1d82256f5db03b SHA-1: 053921a2b23051b564fec9463011aaef3fb14a2e SHA-256: 69b2181a1ad1056c1fa160598a9fecb1d543d75defa7190f10107c450e5255b0
214 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it employs social engineering lures, specifically attempting to trick users into installing remote support tools or browser extensions. An embedded JavaScript stream was also detected, which could be used to download and execute further malicious payloads or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://litroshaber.net/resimler/files/pirugojixemigut.pdf In PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/79680642435.pdfIn PDF document text
    • http://hzdsbg.cn/uploadfile/1630783671.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/nezijixegorekituzi.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/xufipu.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/ravotijufusunogu.pdfIn PDF document text
    • http://mybyblos.com/userfiles/file/33322922253.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/milolagarasilonerusogawe.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/wumasisara.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/35196911249.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/pasowokotaxokelekexalano.pdfIn PDF document text
    • http://a-pluset.com/userfiles/68078636293.pdfIn PDF document text
    • http://tanabuauto.com/js/upload/files/sekupaduvamalewaxaluwofi.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/jagolazijenesifekawokata.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/gagajepufupirodakezuxipew.pdfIn PDF document text
    • http://vistobrasil.net/uploads/file/9654174168.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/maboloxolegowuvu.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/gizelebaborudakatu.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149300b8146d---39263158989.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/70593483710.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/lemagixotiwisovawutigaxof.pdfIn PDF document text
    • https://888nv.ru/userfiles/file/sibidatopez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+control+my+desktop+from+my+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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0001078b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1078B 17572 bytes
SHA-256: 4bd7f4279ca0c880edbfeb9d426a21d36ad3b318bc46f1c71bfbf231ff5e5cb2
font_00_sfnt_off0000ef7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12253 18044 bytes
SHA-256: 36ebd5732ab24036f14185bedec7dc2d8c355d8f0755dbd0a7d48499b2319abc
font_03_sfnt_off0001513d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1513D 10912 bytes
SHA-256: 398210e9deb4c5f5fd44f8ca5140959d74d49c4b27d0133f8fe6b3539755b719

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