Malicious PDF — malware analysis report

Static analysis result for SHA-256 54bca7b3c87ca05b…

MALICIOUS

PDF

75.4 KB Created: 2021-09-13 07:22:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b4101e91bbb9c00655249c278acd0c9d SHA-1: 5dc5da3bfa4bf904c69544572a1489d8ba1db2bd SHA-256: 54bca7b3c87ca05bfe6e1066738a93025054b535383d0ce4a91f8447d3739b82
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous external URLs suggest a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://studioguidobarbieri.it/userfiles/files/36975489286.pdf In PDF document text
    • https://guclupin.com/calisma2/files/uploads/talotalivuvumisejosini.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/vufif.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/wuziratupofamuposadevada.pdfIn PDF document text
    • http://storemisr.com/uploads/files/428400013.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/39733901256.pdfIn PDF document text
    • http://sjhtractor.com/d/files/gekedugibizegifuwugi.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/xakuzizaxigewufa.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/moliwebijorewek.pdfIn PDF document text
    • https://bhopalliteraturefestival.com/mpsdp/uploads/files/70779957493.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/44434353590.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/64655134914.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/09/file/kutotelarazudupatipeweli.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/41887659508.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/jipobeworir.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/subafi.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613440dee6e9c---wotozo.pdfIn PDF document text
    • https://valergences.fr/userfiles/file/46561337500.pdfIn PDF document text
    • https://norservis.info/files/files/39690022282.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/jegatejutojefedikobavi.pdfIn PDF document text
    • http://ailizia.com/userfiles/43468363564.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb5e156b4b---48690809841.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/vonarajuponinirat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=research+evidence+pyramidPDF 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_off0000c4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BC 10740 bytes
SHA-256: efbe5a81371e8a1772b7da9e7e8b4f24ae8e0b77fbd170f9276d28ee7e712a6e
font_01_sfnt_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF554 16796 bytes
SHA-256: 5d29709e3014e298496a040a73499d9305cdc338527bd5c2da528359d895d8c5

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