Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fe48deb08a384c5…

MALICIOUS

PDF

93.6 KB Created: 2021-09-12 01:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 118fcb17c7ece09c4dc07f0ff1592e81 SHA-1: 3e433d6a7ff808358d3f655e9cf8e0b6fdf4aaeb SHA-256: 2fe48deb08a384c547a37fe37c311e2926642c16c28167317aa3e4a9ec33d235
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a common phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://skykharchono.mn/editor/files/wevirukijugebiloba.pdf In PDF document text
    • http://geotersrl.it/file/labodobemaxusafavegelopo.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/vodutowutowakeg.pdfIn PDF document text
    • http://wcsps.com.tw/ckfinder/userfiles/files/japuzawepo.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/51405762357.pdfIn PDF document text
    • https://brakos.it/file/bomubosa.pdfIn PDF document text
    • http://jeanchapleau.com/userfiles/file/zinemivanusofumesuvagafi.pdfIn PDF document text
    • http://abnicum.com/files/file/kizopawupego.pdfIn PDF document text
    • https://polytex.de/sites/default/files/29943985111.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/bugud.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/pefupob.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ad5323943c---2143418900.pdfIn PDF document text
    • https://premiersuli.hu/files/files/telifunuxeled.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/41522747601.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/53668212808.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/lazejobop.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/rusegot.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/10560637393.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/nojazipadis.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/22047959175.pdfIn PDF document text
    • http://gocchame.vn/app/webroot/img/uploads/files/fadogin.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/10719030580.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/52133172418.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/b6321ccdd962d680d6c61021ef92d5fc/pabaru.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/wiwureluzojatok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=fortnite+save+the+world+free+ps4PDF 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_off00010b2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012346.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12346 10800 bytes
SHA-256: 241bf6618f982aedf552e63df617651d5a4319f3b1c382823e962be04a2fa6b0
font_02_sfnt_off00013c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C27 17344 bytes
SHA-256: 797ac3fe14b75631e57d3749b19b14e2e084324b0ff7b736349a920189e8eda4

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