Malicious PDF — malware analysis report

Static analysis result for SHA-256 98835222b1162924…

MALICIOUS

PDF

79.2 KB Created: 2021-09-22 17:17:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fddf0f070441f8c433ba252151edf7fa SHA-1: 1eed7751801c470414e91e4092b717a279522261 SHA-256: 98835222b1162924ab97c9f11c10f0fdecfd858f5e758da3e6c1f85c163632a8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs pointing to various domains, many of which appear to be disposable or used for hosting PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, and the ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL distribution are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://queure.ru/uplcv?utm_term=mengecilkan+size+foto+di+hp PDF link annotation
    • https://aluminiosarla.com/userfiles_arla/files/velozuvivumekatez.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/faninodir.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/89590653617.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/20468014980.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/80511142370.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/62946385706.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/36080975800.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161362cfce40dd---velar.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/16143f794702f4---34678698639.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/54769053536.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/59954285118.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/75651114336.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/7249758362.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/povozipituwi.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/refubi.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/43519813968.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/dobakikenoletutuseki.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/tivodowuwanevi.pdfIn PDF document text
    • https://evergreencans.com/userfiles/file/sikerifufagumikajudalower.pdfIn PDF document text
    • http://rigassprotes.lv/uploadz/file/22957686805.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/desonotarojun.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/59213392514.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/gasix.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E3 16620 bytes
SHA-256: 71d85e30ad1738f3fe86e6b5863e0a71d1cd275f9c11bc06c77e885dd57de423
font_01_sfnt_off0000fe27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE27 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001163e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1163E 10944 bytes
SHA-256: cb3ae00d6c3442b23ddccea6bbfeb34db01acc6b620b4095b093f045fd64c635