Malicious PDF — malware analysis report

Static analysis result for SHA-256 465bb1320d29735b…

MALICIOUS

PDF

80.1 KB Created: 2021-09-15 06:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1a138ed5d86da2f6f05c345ddf331bbb SHA-1: 8bd3cf0f338a928648687044c7871c72349ca1cb SHA-256: 465bb1320d29735b30e5f341165bfb13be751a8f5e8af1642eef2c33b9eff42e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, 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. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://synerhu.ru/uplcv?utm_term=espncricinfo+app+apk PDF link annotation
    • http://instant-image.net/UserFiles/Site/File/gipome.pdfIn PDF document text
    • http://noithatmfc.com/media/ftp/file/61649860962.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/latepanabas.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/42613122901.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/89983322961.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/wifavageg.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/88031857975.pdfIn PDF document text
    • https://bio86.net/userfiles/fichiers/fawajidinixazizo.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/22230894872.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/dofozemolenize.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/93753064171.pdfIn PDF document text
    • https://sklepbonus.pl/userfiles/file/gamirireriwemuxuvoj.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/biwobalajajufibewurekogo.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/pivogupuxijaseki.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/roxuwuwo.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/goxiguroniganemot.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302d1f739f2---98406620757.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/nhgambfc5tvdtme48m6h1033c7/datetemifo.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/2001748035.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/22298242878.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/sexebujexas.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/titunujabawafu.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_off0000d53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4F 17620 bytes
SHA-256: 4abb741a19b9e46149f46ca05ad6ec80c56fa62f5ac00de8ca5641a8dd679856
font_02_sfnt_off00011b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7D 10272 bytes
SHA-256: c238cac81588da669fef14b6d6cf4e3d5b055f883b85c7b6fa3386295097e334

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