Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a2ebca511753eed…

MALICIOUS

PDF

78.1 KB Created: 2021-09-16 09:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b09553caed168aab964f05bf5ef1556 SHA-1: 24e5610ad55b2a65d8fdaa2c1c2a68bf0067b3cf SHA-256: 5a2ebca511753eed6147694d1578cdebeb4bdf4366a983bb7952c8eee96c4c21
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery through these links. The document body is unreadable binary data, providing no further context.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://hoanggiaphatland.com/uploads/image/files/diwemefovodewemipuku.pdf
    • http://1day2night.com/UserFiles/file/71854712266.pdf
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/88633453458.pdf
    • https://archielectronics.com/userfiles/files/kumeborosale.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428ce362eb9---kopob.pdf
    • https://strings97.hu/userfiles/file/xifotibakiduzalilutizara.pdf
    • https://hkfew.org.hk/ckfinder/userfiles/files/lijoxuxojituvovulijumoti.pdf
    • https://aashianarealty.com/file/povunifupeginiboxonoru.pdf
    • http://oris-am.com/editor_up/97219567824.pdf
    • http://irvinenott.co.uk/ckfinder/userfiles/files/51811111873.pdf
    • http://skpizzasubs.com/uploads/files/bikojakujarazisumoxiza.pdf
    • http://xn--80adpfaaeictf0c6c7i.xn--p1ai/public/file/romulasafavaguv.pdf
    • http://ambvetbrashersclavoghisu.eu/userfiles/files/68979417053.pdf
    • http://christ-china.com/filespath/files/20210907025755.pdf
    • https://homestayhoian.vn/uploads/image/files/89305551710.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/89429040025.pdf
    • http://provia-events.de/pics/fotos/1/file/33616143711.pdf
    • http://1day2night.com/UserFiles/file/panatilevijezasafibu.pdf
    • https://giant-nano.com/app/webroot/userfiles/files/63355414220.pdf
    • https://eghamatkade.com/basefile/eghamatkadecom/files/fawavij.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=angry+birds+transformers+mod+money
    • 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_off0000cd00.bin
7d47f4877bcc2e9ec3a03263656ab1e4a4267af2c0f55c338f230f50cd86ca61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD00 17588 bytes
font_01_sfnt_off0000fa6f.bin
9c584e5f23ada0dc2c8c5b1f67aec5538f3b5e896571cc82ef23c42c7f6f5bfd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6F 10884 bytes
font_02_sfnt_off00011379.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11379 16792 bytes

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