Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd20d26a6a1f106…

MALICIOUS

PDF

70.8 KB Created: 2021-09-26 07:35:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0e01339fe28fb400bcf1e4d9573b34a2 SHA-1: 148347e4c7927788afac0cf5556850279b447b70 SHA-256: acd20d26a6a1f10690663d483ccc680a51dc1376b88a1cce6459520c02973e3b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are structured as link farms. 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 initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://arabic.cz/ckfinder/userfiles/files/66470912490.pdf In PDF document text
    • http://cioccolatogallucci.it/userfiles/file/fesazimasizejixofoje.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/43059151537.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/litidilizakufu.pdfIn PDF document text
    • http://mathahospital.org/userfiles/file/6535378469.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/44742230405.pdfIn PDF document text
    • http://business-baltic.com/myfiles/dok/vabonasevuforutidotog.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/24599165262.pdfIn PDF document text
    • https://soyana.de/js/ckfinder/userfiles/files/42442085664.pdfIn PDF document text
    • http://patroha.hu/file/44061935141.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/71519871350.pdfIn PDF document text
    • http://lobanowscy.pl/userfiles/file/mutefabuwoxinuzokereki.pdfIn PDF document text
    • https://kimcert.org/E/file/10637561201.pdfIn PDF document text
    • https://vpmemorial.net/images/file/44221035572.pdfIn PDF document text
    • http://exima.kr/userData/board/file/4569590854.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/wagimonuleje.pdfIn PDF document text
    • http://spartapr.com/images/upload/file/julododamegefijis.pdfIn PDF document text
    • http://www.bash.cl/media/file/xoxemufupipazagale.pdfIn PDF document text
    • http://furniture83.com/upload/files/wuroxivijip.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/gejitobivimitofezebuwuxot.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/komakoz.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/89840873384.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=glow+hockey+2+playerPDF 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_off0000b32d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB32D 10460 bytes
SHA-256: e8df03789dbcba9201dee6719a721a09f229741df04918fa04154d5fa07fb2a1
font_01_sfnt_off0000cb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB39 16584 bytes
SHA-256: a3a97f799f4513e6cb8078487ccc960694a1cf679299f048b11f43cefa8a4612
font_02_sfnt_off0000f542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF542 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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