Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b68a410e3ff0f73…

MALICIOUS

PDF

69.2 KB Created: 2021-09-16 12:25:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 46936c2984637eeb447a9a549cf35d31 SHA-1: 10dd6e8d476f4e86069518e8d3fcc2ee922652a3 SHA-256: 2b68a410e3ff0f733227bd2984ce496dd9324e7f2f3a5b4283fe4a65b4199a2d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting and form a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware or engaging in phishing. The embedded JavaScript is likely responsible for executing malicious actions or redirecting the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • 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://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/22945816992.pdf In PDF document text
    • http://ap116.ru/userfiles/file/59624897273.pdfIn PDF document text
    • http://scarpatti.com/files/guditidinutibeboxirus.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/6062353766.pdfIn PDF document text
    • http://snieznik.pl/userfiles/file/vuzex.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/wilerusafosedis.pdfIn PDF document text
    • http://scro.ru/pic/file/vedixade.pdfIn PDF document text
    • http://sjhtractor.com/d/files/87303834010.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/pewomokal.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/kuvelikusapofawavaxire.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210914_91AF9B6352133D57.pdfIn PDF document text
    • http://epmresearch.org/userfiles/files/60340232517.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/mafotexewafob.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/mudakonev.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/polarupu.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/2883484661.pdfIn PDF document text
    • http://strandedtattoo.info/file/95248562456.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/46292245157.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/99801614280.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/xizofifaxidumozizeja.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/70562901355.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/veluvito.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/3970629675.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=fanlift+instagram+followers+apk+downloadPDF 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_off0000afad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C4 10996 bytes
SHA-256: e1ae2ebd4803d4417e3c09d25617ac9d38459a48f425a79cfc88a6fe0bb26a1f
font_02_sfnt_off0000e11e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE11E 15252 bytes
SHA-256: 09d30b0d1afc66535bc9a1cf3ba86ce432764898e209c19c06921474815a2cf7

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