Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f1f014086cc48a2…

MALICIOUS

PDF

94.5 KB Created: 2021-10-13 20:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4505fd7c152137117a2b3d58330462da SHA-1: fdf51d3693be6f8dc0d28cacfeb09615b6d7042e SHA-256: 5f1f014086cc48a29bb3a46311e33dc6aa49e334bc47dc2fc575c6f309ed626a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links, suggesting a phishing or spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://brandweeramsterdamamstellanden.nl/userfiles/file/52957710651.pdf
    • https://bangvetthuong.com/luutru/files/borupawuteno.pdf
    • http://aurangabadptti.com/ckeditor/ckfinder/userfiles/files/vefudebajokotadijafa.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/16166c52e430e4---67680696089.pdf
    • https://spcinternational.in/ckfinder/userfiles/files/27878600247.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c44768eadc---3279882686.pdf
    • https://ismart99.net/upload/files/zawap.pdf
    • http://msslink.ru/userfiles/files/83118764609.pdf
    • http://bangtutrang.com/upload/files/4764057563.pdf
    • http://bibikid.ru/upload/kexanelizamesizigas.pdf
    • http://cermak-expo.cz/data/files/file/21801691420.pdf
    • http://krupongs.com/images/file/letut.pdf
    • http://changzhou.chinatupai.com/web/js/ckfinder/userfiles/files/46752958981.pdf
    • http://saigonford3s.com/uploads/2021-09-15/images/files/xopegibenoliwawun.pdf
    • http://sakem.org/userfiles/files/51832121258.pdf
    • https://studiovizia.com/webroot/img/content/files/roxefozomigox.pdf
    • http://hugslock.com/app/webroot/img/files/72966254513.pdf
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/lakovazuwobep.pdf
    • https://ww150005.linebot.net/upfile/files/20210918045356.pdf
    • https://dgssu.com/upfolder/e/files/20210925042031.pdf
    • http://wjvanderheidedienstverlening.nl/uploads/file/6605810274.pdf
    • http://hyunsin.net/userfiles/file/48447307450.pdf
    • http://tipkeo.com/js/ckfinder/userfiles/files/78134732620.pdf
    • http://feedproxy.google.com/~r/Xvkpad/~3/TSvcnjQ06Jg/uplcv?utm_term=vector+algebra+important+questions+with+solutions
    • 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_off000100b3.bin
d815b02ad45329171ad832f272287fc4287e5bec092f795ad169e14b33182a53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100B3 21144 bytes
font_01_sfnt_off0001386a.bin
7b050d8665b4445bba30620d52d98791d29a0dae4ce6416a13ce410653c11d4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1386A 11260 bytes
font_02_sfnt_off0001522f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1522F 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.