Malicious PDF — malware analysis report

Static analysis result for SHA-256 c25f77f8ca20a974…

MALICIOUS

PDF

70.6 KB Created: 2021-09-20 16:15:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 81b0b2fbd180dfb282a240e03233f128 SHA-1: c74501f90d393331a1b7e5a7c84daabd9016c20b SHA-256: c25f77f8ca20a9746a917b73c36f8b6faed4edc88500d34dedfbe83a476cf128
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users to malicious sites. The presence of numerous external URLs, many of which are on disposable hosting, further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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 https://synerhu.ru/uplcv?utm_term=watch+paw+patrol+online+free+full+episodes
    • http://ucokampen.com/media/files/58562793315.pdf
    • http://autothudo.vn/upload/fck/file/manep.pdf
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/fabibebejojixo.pdf
    • https://jgranit.pl/userfiles/file/24557031907.pdf
    • http://ahknchem.com/upload/files/40356622406.pdf
    • http://modernplating.com/userfiles/file/jaboxufarik.pdf
    • https://warsztatgdynia.pl/app/webroot/media/files/92796399966.pdf
    • http://podarox.ru/public/files/98483891043.pdf
    • http://metabolit-plus.ru/files/file/soxewexopimo.pdf
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/60486335895.pdf
    • http://tobn56.com/UpFiles/file/36532664790.pdf
    • http://londonjip.com/userData/board/file/nanuva.pdf
    • https://www.tunnel.de/files/uploaded/file/70776850330.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/8p3rvrqmflq72hvl2881qo1v3s/kuvijawobididosejuzo.pdf
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/46747494187.pdf
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/19879336548.pdf
    • http://elcivan.com/admin/UserFiles/file/felisusegapukiposu.pdf
    • http://geasit.it/userfiles/files/kirolob.pdf
    • http://erainbowrealty.com/userfiles/file/luxoka.pdf
    • https://ppntassone.it/dati/upload/file/tazejopevalop.pdf
    • https://aodaixuan.vn/app/webroot/upload/image/files/93417020922.pdf
    • https://apskarota.org/userfiles/file/52014866761.pdf
    • http://carrozzeriardue.it/userfiles/files/linudagazarezime.pdf
    • http://falegnameriacastiglione.it/userfiles/files/wokosawivezolaloramo.pdf
    • https://sanipro.ma/app/webroot/uploaderfiles/43591833857.pdf
    • http://partnerplus30.ru/images/fornews/files/xizemokowonubojerepazo.pdf
    • https://alves.bg/ckfinder/userfiles/files/kodesiwit.pdf
    • http://longtra.vn/userfiles/file/31858807181.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b43f.bin
3a1815b2371a1da30f8db19746a1372ee9a8f67d207806485e1ac451b510bca2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB43F 15292 bytes
font_01_sfnt_off0000db00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB00 16792 bytes
font_02_sfnt_off0000f317.bin
59736b6103563befb45e11de8dca1492bd0ef4178fb47d91bb103c619c61949e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF317 10896 bytes

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