Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6868c15c726014…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 11:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0bf7c1f492c82051276f0d22227c7e5 SHA-1: c271c2033b0de6c7e00fa2d0a51a8211c6e73431 SHA-256: df6868c15c726014a49132b8f444fe902a116cabeffeec6c00d1abe303a109ff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity, likely involving the exploitation of PDF viewers or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • 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.
  • 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://coretry.ru/uplcv?utm_term=top+gun+streaming+service
    • http://ohmytour.kr/FileData/ckfinder/files/20210916_AA6D52C3E2509033.pdf
    • https://tempatpasang.com/contents/files/nabexifisufokapimunolifuk.pdf
    • http://langeline.com/ckeditor/upload/files/vudowofaligojepomi.pdf
    • http://pospatrans.cz/UserFiles/File/safafematolexogawaw.pdf
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/97650421771.pdf
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/16142167c0bda2---34273890216.pdf
    • https://monographie.com/ckfinder/userfiles/files/bifekivodewavodino.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/glta8ain9ithl59tv070985dv6/90418694409.pdf
    • http://haithuanphat.com/uploads/files/sinijogupixisexoko.pdf
    • http://nzozkrowodrza.pl/uploads/editor/file/tivuwemuvog.pdf
    • http://0vote.com/ckfinder/files/tesufegaxewamoluxoxazax.pdf
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210906182746.pdf
    • http://tahi.hu/ckfinder/userfiles/files/36732720778.pdf
    • https://mcdelandes.ca/uploads/file/24995845565.pdf
    • https://samsungklimalar.com/upload/ckfinder/files/85039479423.pdf
    • http://suvagcentr.ru/userfiles/files/feremoduxaxoteka.pdf
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/piropivise.pdf
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57033683266.pdf
    • https://dla-pracownika.pl/pliki_user/File/48781715908.pdf
    • http://oreoltour.ru/sites/default/files/file/lazotujirarog.pdf
    • https://residenciasanamaro.es/userfiles/files/54283355832.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_off0000afd7.bin
bbc449e68e31b7c435fc3fe1f329589978654b07a23125de225618737dc36c44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFD7 15412 bytes
font_01_sfnt_off0000d706.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD706 16792 bytes
font_02_sfnt_off0000ef1d.bin
64d06f559d4a9c04727d3a1d2b570272e2c5c34c6ee6e475eea4091b6d58f353		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1D 10800 bytes

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