Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf35a7cbd477608…

MALICIOUS

PDF

83.4 KB Created: 2021-09-13 10:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 925901998633f48deb3ca1d53211a894 SHA-1: e88f336d807492993b0c10238c3f5714755ef319 SHA-256: fcf35a7cbd477608fdfe61e56757613715f0bec676b068e05a9bfbcd8a4d531f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded links, many pointing to unknown or potentially malicious domains, disguised with search terms related to a popular game. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these links are part of a link farm designed for obfuscation or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://yogaschoolofkerala.com/photos/editor/files/5007340323.pdf In PDF document text
    • http://ayrh.internet-match.com/upload/files/98403498959.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/feb09f52c92fa8b506f435cfaebd9720/popijafulife.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/serapakeburudixifigox.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/20926763841.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/fokasukad.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/zezigoseloxan.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/gedudubuxe.pdfIn PDF document text
    • https://mcq.bmtinhoc.vn/InteriorWeb/images/images_news/files/vubusadamavekul.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/9186051502.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/musoxog.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/mumutoramedifusarekiwa.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/laxuzatajegun.pdfIn PDF document text
    • https://istanajp.net/contents/files/ditonegetivimasa.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/51234051445.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/rujunagivemitadefoloz.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/vunepopax.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/xitajigufor.pdfIn PDF document text
    • http://exim5.hu/_user/file/joburedid.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/40728129494.pdfIn PDF document text
    • http://e-sheremet.com/img/balijazanatulorowulit.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/segimexobawan.pdfIn PDF document text
    • http://phubozena.pl/userfiles/file/kusituzikunodeferuna.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16132445802e02---kenadipolozobafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=five+nights+at+freddy%27s+2+mobilePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBD 20228 bytes
SHA-256: 9ee5e3d569c23b9b537bc97b679bfe30e82cbaf4f7d8593cd3dddf44396d52ec
font_01_sfnt_off000103f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C04 1888 bytes
SHA-256: 228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105
font_03_sfnt_off000124ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124CE 11252 bytes
SHA-256: 36bef6979d187ca55828e16400a245210df031a8939a1c8bda3e70321f1a1187