Malicious PDF — malware analysis report

Static analysis result for SHA-256 527b3e8ea9a26e7b…

MALICIOUS

PDF

82.5 KB Created: 2021-09-08 19:47:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 224a78189783cfc3e281a56ef5460751 SHA-1: b47b1e3bf0115eefe2bb9b5827073b7e91633694 SHA-256: 527b3e8ea9a26e7b1c6e7d57dc312876cfdb73b1be0351ae02e81b9db37af8d9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further confirms malicious intent, likely to lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://crewmak.ru/uplcv?utm_term=virginia+woolf+pdf+download PDF link annotation
    • https://turismo-galicia.es/ckfinder/userfiles/files/41208396224.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/guvalemuz.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/jagepijanegamefun.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/dipazegisarofipujedos.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/jaxoluxupi.pdfIn PDF document text
    • http://optimaglobal.net/ckupload/files/42093777256.pdfIn PDF document text
    • https://vanrun-it.nl/userfiles/files/25282521292.pdfIn PDF document text
    • http://e-district.org/userfiles/file/vagositajejunufolawobine.pdfIn PDF document text
    • http://fnathservices.com/upload/file/devejetazijedonunir.pdfIn PDF document text
    • https://nasikampung.info/contents/files/goramuvakebavelomuninifa.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109080914513174.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eddc8d7e84---37392521437.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/guluweweminuwo.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/gobejiw.pdfIn PDF document text
    • https://cv-vezouze.fr/media/file/zelozejumiso.pdfIn PDF document text
    • http://oralrem.kz/ckfinder/userfiles/files/95156261411.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/kibebajagofilaz.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/pukuvokegebozebudafubobez.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/54031427488.pdfIn PDF document text
    • https://bamfieldrental.com/userfiles/file/dufuxetidoz.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/nubiwajef.pdfIn PDF document text
    • http://htwy.com/upload/file/38122786024.pdfIn PDF document text
    • http://mmdplus.com/userfiles/files/20210908_163556.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_off0000dea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA1 18040 bytes
SHA-256: da6a497b7c9a9133b7635e02998de24c45614ac322a104736fb370164f68f3d7
font_01_sfnt_off00010d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6D 10332 bytes
SHA-256: e1af34e9d35af751cd5b289dd273368bb71d2dc2dee2e84fff7b597cedc09374
font_02_sfnt_off0001249d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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