Malicious PDF — malware analysis report

Static analysis result for SHA-256 8096b18af1ea5ea9…

MALICIOUS

PDF

89.4 KB Created: 2021-09-09 22:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 299ef1c933cdd748cd9842e3d901cdea SHA-1: 7f200b8c94d9305e897b2e65670b00026903e839 SHA-256: 8096b18af1ea5ea946753d403c46448a1cf66490a1e6cabe20839a9afc43ac67
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a high number of embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The ML classifier strongly indicated maliciousness, and the heuristic firings confirm the presence of external URIs and a link farm structure. While no scripts were directly extracted, the overall pattern points to the document serving as a gateway to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 4

  • 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://medvor.ru/uplcv?utm_term=puaada+punjabi+movie+watch+online
    • http://salonorganica.ru/upload/files/bunutobefod.pdf
    • http://otoozevran.com/resimler/files/22822026367.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/72268029796.pdf
    • http://dges.in/userfiles/file/xoxedagi.pdf
    • http://dragoniresorts.com/userfiles/wujinizulejovup.pdf
    • http://nhactheducthammy.com/upload/files/patugobad.pdf
    • https://maritime-models.com/userfiles/file/xolidivulidoluli.pdf
    • http://stlukesfp.org/ckfinder/userfiles/files/tokuweroguzozaboviden.pdf
    • http://hataylezzeti.com/resimler/files/fejafimixojubar.pdf
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/43081837012.pdf
    • http://botosani.ro/img/uploads/file/48662734879.pdf
    • https://groupekheidri.com/ckfinder/userfiles/files/guzedigodumun.pdf
    • https://ritascreation.com/userfiles/file/33882687087.pdf
    • http://xnucleus.com/members/member_images/files/zurotog.pdf
    • http://studiogeologicotrilobite.com/userfiles/files/nemutanimisas.pdf
    • http://mkconline.com/landmark/ckfinder/userfiles/files/tonufusaludozudefebev.pdf
    • https://avigailpekelman.com/sites/default/files/file/2311133358.pdf
    • https://xyoaa.org/sites/default/files/files/bulalenevukanilagoko.pdf
    • https://samajsutra.com/userfiles/files/4892719118.pdf
    • http://pospatrans.cz/UserFiles/File/zuxet.pdf
    • https://styliststudios.com/imagesTE/file/jegekejodanelupi.pdf
    • https://bselink.com/userfiles/file/gezot.pdf
    • http://stihoplet.by/upload/editor/files/34883855478.pdf
    • http://ultraljud.nu/bild/files/pofibugakawofeneva.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_off0000f921.bin
6920ab07d3772b6d79b834069aa3c59181b11bef554839e094fc3d411001dd5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF921 11036 bytes
font_01_sfnt_off00011255.bin
9ffbec164eb3d59efa08f47de63cd2aa8b8262d686310977aadcc1963e66074c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11255 17596 bytes
font_02_sfnt_off00013f8d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F8D 16792 bytes

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