Malicious PDF — malware analysis report

Static analysis result for SHA-256 731972af1a31fcbf…

MALICIOUS

PDF

73.0 KB Created: 2021-09-19 13:49:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb613c0ef890985ebf0faede4bf8edae SHA-1: 0f91027bc370f83cd87660d5a3b0c32522d9e445 SHA-256: 731972af1a31fcbfa2d565b75317e69d19307dc53a6c12a5137cf943874857d8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting. 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 0.9963

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://philabc.ru/uplcv?utm_term=mp3+editor+apk
    • http://www.prakashirrigation.com/uploads/fck/files/96665657662.pdf
    • http://tatvideo.ru/ckfinder/userfiles/files/28540070604.pdf
    • http://gok-maciejowice.pl/js/ckfinder/userfiles/files/75220267837.pdf
    • http://hrudolf.com/userfiles/nesijut.pdf
    • http://emirates-offshore.com/uploads/image/file/77735970436.pdf
    • http://papienbanana.com/user_file/file/47204329920.pdf
    • http://angel-conference.org/upload_fck/file/2021-9-9/20210909030628236308.pdf
    • http://palmdale.thepokeluau.com/uploads/files/33266688854.pdf
    • http://weilandensemble.nl/ckfinder/userfiles/files/40014351401.pdf
    • http://stressmanagement-karriere.de/userfiles/file/bopidisifineg.pdf
    • http://dastone.ru/userfiles/file/ruleduja.pdf
    • https://yenicekentkaplicasi.com/userfiles/file/74068391552.pdf
    • http://cmrivestimenti.com/userfiles/files/14984303695.pdf
    • http://konferencii.org/web/uploads/assets/file/xovolix.pdf
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/49138296084.pdf
    • http://www.kizkulesikizogrenciyurdu.com/public/ckfinderuploads/files/luderi.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161413a378ead5---zigovefovefowabowa.pdf
    • http://inarchengineering.it/userfiles/files/55852127416.pdf
    • https://lixtech.com.tw/ckfinder/ckfiles/files/35224211438.pdf
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/10788782410.pdf
    • https://www.sophrologue-nimes.fr/upload/news/files/likagetusolasamaxisurit.pdf
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/30905532274.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_off0000bab7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBAB7 16792 bytes
font_01_sfnt_off0000d2ce.bin
088d8a281eb0de3747edf68459219c6cce4809533cb704e070ffec12266246de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CE 10324 bytes
font_02_sfnt_off0000ea3f.bin
6b247da108ce4fcdac5947b395f5b5b26b571b22f2787bb3974f563d5cd1310d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3F 17288 bytes

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