Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f7337f9c454e711…

MALICIOUS

PDF

72.3 KB Created: 2021-09-15 23:54:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 32875f1b50e7e366143d50415e97dd34 SHA-1: 022f183af941b6972e6d767f128eafa532d51e23 SHA-256: 1f7337f9c454e711f388a2a5b18fd4fb9a7898473fc8b41affb1e896c1063bbd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to various domains. The document body was unreadable, but the overall structure and URL analysis suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/5c6e716fb79ab4f618522acf05d5a3e4/7030037142.pdf
    • http://fuyu.010bi.com/ckfinder/userfiles/files/68987491977.pdf
    • http://www.deopendeur.org/imgUser/file/85446855621.pdf
    • https://workinhotel.com/upload/fckfile/xowemotogusodanusar.pdf
    • https://aquaprosmart.com/userfiles/files/tudejeduzuxasenareja.pdf
    • http://ledins.lv/cms/file/vatekakobozuxak.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135297680c86---tusixegiwuxuluxuduxivol.pdf
    • https://onsale.social-push.cc/data/fckeditor/files/57055658803.pdf
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/7479510978.pdf
    • http://downtowncincyhotels.com/core_degree/admin/images/cms_imagesfiles/witizu.pdf
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/28277988791.pdf
    • http://brain-sh.tw/upload/file/wunawelajagimatopowevopu.pdf
    • http://yugang360.com/upload_fck/file/2021-9-10/20210910093559105097.pdf
    • http://adacu.org/userfiles/file/20210913203132.pdf
    • https://ibliberia.com/ckfinder/userfiles/files/xerepovejeborezexa.pdf
    • https://volandovia.it/public/fileeditor/file/sugegelopuvakibexixiw.pdf
    • http://globalbando.com/DATA/upload/files/202109041126324945.pdf
    • https://www.autopsrus.com/ckfinder/userfiles/files/61896244430.pdf
    • http://sochi-polyana.com/ckfinder/userfiles/files/remonejitepusobodikugu.pdf
    • http://clubesquilacoma.com/uploads/files/6155604763.pdf
    • http://musicfriend.vn/public/default/ckeditor/files/gakidatofim.pdf
    • http://egitara.com/upfiles/files/74516909382.pdf
    • http://bilateralmatters.org/userfiles/file/tutesomipekeguzadejixowu.pdf
    • http://londonjip.com/userData/board/file/ropogisarobijom.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=adjust+call+volume+android
    • 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_off0000b76d.bin
cfa80a595f05d9b4cc38e0528a016cd6d607e2b36c4b483fcd7e0478405fab2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB76D 17052 bytes
font_01_sfnt_off0000e2fa.bin
8189e8a92a191350f2f44e44c837a99e0e9331cea5fd6fc2eb91bdcd62868796		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 10808 bytes
font_02_sfnt_off0000fbe4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE4 16792 bytes

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