Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57627e59f87769e…

MALICIOUS

PDF

69.8 KB Created: 2021-09-24 20:31:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8611ffb43992011ea5303700ce48a218 SHA-1: dc55a1bd74f19f97e1f4d9812b802616d7e5dab8 SHA-256: b57627e59f87769e5ee6cbac4d568bf8968394534cc2b912ceca24710bacf8ba
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which point to disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://sarljarry.fr/userfiles/file/nazasurusit.pdf
    • https://acrgruppe.de/userfiles/file/polovofa.pdf
    • https://cupanghitam.com/contents/files/bizofomofawikipifesu.pdf
    • https://digireg.nz/upload/28670413612.pdf
    • http://xn--hh0b97d8is16e.com/userData/board/file/74499284484.pdf
    • https://serihosting.com/calisma2/files/uploads/83340050540.pdf
    • http://gbfrjournal.org/pds/userfiles/files/pogulifefede.pdf
    • https://episcopiaoradiei.ro/files/79795004983.pdf
    • http://kdekdyjak.cz/data/86994028595.pdf
    • http://thoitranglani.com/upload/files/28918461507.pdf
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/bubop.pdf
    • http://abwnickersonplaza.com/uploads/files/20771683992.pdf
    • https://bunianco.com/other_files/File/mogekimadika.pdf
    • http://botosani.ro/img/uploads/file/kabipenujezul.pdf
    • http://regalmotors-jp.com/js/upload/files/8683433208.pdf
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/tiworojo.pdf
    • https://buddhaart.in/userfiles/file/lopoxuwufojulemepuz.pdf
    • http://beauty214.com/uploads/files/202109090833555828.pdf
    • http://w3-japan.com/js/upload/files/7349031657.pdf
    • https://indicaperu.com/userfiles/file/gogutinodigadan.pdf
    • https://go2germany.ru/files/file/84305433554.pdf
    • https://www.agencesramos.com/ckfinder/userfiles/files/vomegamutorixeze.pdf
    • http://goksirlambinowice.pl/img/upload/files/gunetatejovuj.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161431465a0bf7---54625425124.pdf
    • http://jyjjapan.jp/files/ckeditor/files/musotadi.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=indian+idol+1+judges
    • 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_off0000b062.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB062 16792 bytes
font_01_sfnt_off0000c879.bin
f16c4c0a73a7131f8ef4ace2f506a04d3b494b139eb1aada28848abf30c25f94		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC879 10456 bytes
font_02_sfnt_off0000e00a.bin
b90931c3015fa241b6f2b129aeb8522da3297581ed8884602b0f1cfc2f0245de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE00A 16604 bytes

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