Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1c352357d0c9cfd…

MALICIOUS

PDF

74.2 KB Created: 2021-09-11 03:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: f480a2bdab4f60b202263e6b1ade7cc1 SHA-1: 8ff53f444398563718b53588abf11983f2013ee0 SHA-256: c1c352357d0c9cfdb94bcf23eda123cdc214c1d070203503240dd900150cf68a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files on potentially disposable domains, suggesting a link farm or redirection mechanism. The PDF structure and embedded content are consistent with phishing or malware distribution lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://temple.mo/userfiles/file/jesetujosanuvududa.pdf In PDF document text
    • http://npas.ru/pic/file/tedizogalokitibopetulaguj.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/moguwefogasigawoxekog.pdfIn PDF document text
    • https://kuepancong.com/contents/files/wapanifegolidasak.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/sezevifomokafuda.pdfIn PDF document text
    • https://marosme.ro/hirek/file/rewurebumubogipopazufi.pdfIn PDF document text
    • http://tvoirostov.ru/ckfinder/userfiles/files/melajeranexudugerim.pdfIn PDF document text
    • https://ever-progress.dacola.com/upload/files/16725150899.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/70647544810.pdfIn PDF document text
    • http://pmke.cz/pictures/files/7261414789.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/filagolug.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210911_D5D5070D7063BE1E.pdfIn PDF document text
    • http://maksimetall.ru/files/kofexalarunekunabalid.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/33338415734.pdfIn PDF document text
    • https://mgs-on-track.com/uploads/misc/files/gerugojadorora.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/nefobizefitosi.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/gugiz.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/xatapukuwakijinuvo.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/5e6hn2ipa6merihi64bvtslv24/87771468152.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/40964828612.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/94370672222.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=biggest+country+by+area+in+worldPDF link annotation
    • 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_off0000bce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE7 17372 bytes
SHA-256: c298613eb425e9b3dfb42d40a55f5116cf344a0359bc5fd203c66f0ad7623844
font_01_sfnt_off0000e997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE997 11036 bytes
SHA-256: ef4acfbee59f2fbe403e9829aa87dc1dbeb7197e1a32354ee885e6a8ebad59d0
font_02_sfnt_off00010356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10356 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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