Malicious PDF — malware analysis report

Static analysis result for SHA-256 4444fe6c84959653…

MALICIOUS

PDF

75.6 KB Created: 2021-09-11 21:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d7262573c4c54640cc428dea7d8fe3a4 SHA-1: 52dad404274b9165ddd142039e16f17fe2dfb339 SHA-256: 4444fe6c84959653bfe1483d1d134e893d490292ab9eb6ad62a1534ffa386b7a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. The presence of a 'Password-protected archive handoff' heuristic suggests the document's purpose is to trick the user into decrypting a payload. The document also contains a link farm with numerous URLs, many of which are hosted on potentially disposable domains, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ykitraders.com/UserFiles/file/47471050224.pdf In PDF document text
    • http://thuocamakong.net/userfiles/image/file/maleduvogenu.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/86602231488.pdfIn PDF document text
    • https://szallas-karpatalja.hu/upload/sijasexeperirarid.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013new/admindia/ckfinder/userfiles/files/pexelejubeporu.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/8856794756.pdfIn PDF document text
    • https://free-spirit-city.eu/uploads/wysiwyg/files/gidejigigewobimez.pdfIn PDF document text
    • http://sanalights.com/admin/admin/uploadfiles/file/24854131833.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/bowewunuzatagirivutolewib.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/25067594133.pdfIn PDF document text
    • http://fitviewer.info/files/file/geripudagorowuboxalu.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133037be10ae---8316947284.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/29778013431.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/80803804413.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/76649136802.pdfIn PDF document text
    • https://harmony.im/userfiles/file/84156471414.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/delatexovili.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350db04af2c---paxuras.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/99597395919.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/nareze.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/witosifumiwagogef.pdfIn PDF document text
    • http://intemhathanh.com/img_duhoc/files/xawerin.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/30983037951.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=file+gta+5+ppssppPDF 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_off0000c314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC314 18128 bytes
SHA-256: 5a8f477695d99d55536a5ef3e5fba3c291b7f064d54addaef1a4871f5f6d3296
font_01_sfnt_off0000f1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A1 10216 bytes
SHA-256: 0e004dfe0822dfb043139b31d611860e463c1a98fc1e4f7bac9c5f39bc64d3f6
font_02_sfnt_off000108b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1