Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bfb07bccbab3983…

MALICIOUS

PDF

85.9 KB Created: 2021-09-18 03:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 13fdc0c89ba1a2a61a8ea98e640d78cc SHA-1: e5b3c3550db9b92db9ad36244067e4aadc6c7217 SHA-256: 9bfb07bccbab3983dcd70b4571bb06f36271fe73087c80901816a79dbe52d44c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://imhkayseri.com/resimler/files/59463790854.pdf In PDF document text
    • http://kamienneogrody.com/userfiles/file/boragikogifabow.pdfIn PDF document text
    • http://all-premium.com/user_file/files/mezikazesovujoj.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///37042947151.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/73731822680.pdfIn PDF document text
    • http://chemonova.com/FCKeditor/file/tekowov.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/17478130429.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/gumanozibitan.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408b958938c---45578032296.pdfIn PDF document text
    • http://client.diffuse.info/files/22653754627.pdfIn PDF document text
    • http://taiwanquinoafamily.com/shopadmin/upload/files/44531519191.pdfIn PDF document text
    • http://praconsulgroup.ru/pict/file/zizamurob.pdfIn PDF document text
    • http://taiwangallant.com/uploads/files/202109160207521036.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/28506953184.pdfIn PDF document text
    • https://tl-systems.hu/files/files/32591983962.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/30572209932.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/51858957312.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/10034280926.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/volageluxavufegasogukerin.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/45212215018.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614097422e1f8---kozejexirufigejamasam.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/jukogakut.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/91053831233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=satyajit+ray+short+stories+pdf+in+englishPDF 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_off0000e8f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F0 18152 bytes
SHA-256: e1a6a3fc1af35da2a78701ed36ff1852fe5c9b8afdbc817a3d6b5329ffd8d06d
font_01_sfnt_off00011847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001305e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1305E 11096 bytes
SHA-256: 0b9d8fe2e617717c7a3e116e809faa48bb40c85372e5a7d90ccd6b10646bd450

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