Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b29e486a01cb0c…

MALICIOUS

PDF

88.7 KB Created: 2021-09-12 08:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 660b96faf4609b60a2b1d04399a5f37a SHA-1: e8d7f63d4af378c5c482fdca8d4b43efc9bbd5b0 SHA-256: 81b29e486a01cb0c804a3ff732bf05ba19ec4b93011f3f1c017f177d9ed2eb2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for SEO poisoning or distributing further malicious content. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://myflora888.com/ck_files/files/nemepaxafonitijoluxu.pdf
    • http://smartpaintingplus.com/userfiles/files/wafizuperasivosazisuvas.pdf
    • http://olynskiconstruction.com/pics/file/65988691293.pdf
    • http://maroba-zirndorf.de/file/32470073395.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131c5fabeb2a---jotogebitemopeme.pdf
    • http://dienlanhhuubinh.com/upload/files/76148185190.pdf
    • http://webinaris.org/ckfinder/userfiles/publics/files/46421876365.pdf
    • https://xn--fct8ml6mwue.tw/uploads/files/zepubezutasumozarewisokuv.pdf
    • https://varbackaforskola.se/ckfinder/userfiles/files/zorekezoborupodototeve.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/ad72086340cd5bd3e871362c2a3131a7/41803784198.pdf
    • http://justsayhi365.com/uploads/file/severonapofedenemoz.pdf
    • http://ecole-belair.com/ecole/file/89737427509.pdf
    • https://ascii.tn/web/cgi/file/90235955741.pdf
    • http://songhakbbq.com/uploads/files/99342408828.pdf
    • https://theelementrama9.com/userfiles/files/dibimilopezelitu.pdf
    • http://kargiskola.ge/myadmin/ckeditor/ckfinder/userfiles/files/26677299082.pdf
    • http://simsvizag.com/admin/uploadedfiles/file///79595038363.pdf
    • http://keralatravelpath.com/uploads/file/41793718300.pdf
    • http://bobiniauto.com/userfiles/file/83024802260.pdf
    • http://www.ondebiz.com/userfiles/file/lizoramojemireponenebovu.pdf
    • http://hoachathoanggia.com/userfiles/file/79103330154.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=50+shades+of+gray+part+3+full+movie
    • 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_off0000f22a.bin
0ee1bdd09f89fb3904cc1cd253b99f82c5aef7cab84d0b0ac4adb4a27d1261a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF22A 18788 bytes
font_01_sfnt_off00012251.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12251 16792 bytes
font_02_sfnt_off00013a68.bin
69443e87d12dfd7b4bc3c70e9cc0604e8978d69551e2e34763a2b2f8adb38cb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A68 11452 bytes

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