Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a737359f5f6ba5d…

MALICIOUS

PDF

73.8 KB Created: 2021-10-01 00:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42951783d8119f39a8718542f87923fc SHA-1: 1d06cfcdb31c0e7406e0e30b4b7fdbf910fcf58b SHA-256: 5a737359f5f6ba5d82441cf9e0ca7a35d8e4f8116f148942e2c3f76dabcfb08c
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying a large number of links on disposable hosting, often used to obscure malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://drafthe.ru/uplcv?utm_term=snap+iptv+apk
    • http://clinivetmadonnadirosa.eu/userfiles/files/76018172423.pdf
    • https://gujaratisamajparis.org/upload/files/67084817104.pdf
    • http://z-sinpro.com/upload/files/tisusozuketenenorajejizo.pdf
    • http://sweed-trans.eu/ckfinder/userfiles/files/bukuwebuvobejotafagubu.pdf
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/bemevil.pdf
    • http://www.ecostroyservis.ru/File/66723067303.pdf
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/nibabutefujom.pdf
    • https://webmanagement.produse-electrice.ro/images/file/liwopadavipima.pdf
    • https://lazeo.nl/userfiles/file/dawepoteb.pdf
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155c8f8ad6ac---gulowifubisirukop.pdf
    • http://89928386.com/uploads/files/202109301626035965.pdf
    • https://balticstroy.com/uploads/files/barasurilaw.pdf
    • http://tecs4.com/intranet/ckfinder/userfiles/files/79986537119.pdf
    • https://booking-news.hkdnracing.com/webroot/editor-uploads/files/falagoxozavinamolakutag.pdf
    • http://cnispgroup.com/filespath/files/20210922203113.pdf
    • https://trungtammatnamviet.vn/upload/files/61006519261.pdf
    • https://relans-nn.ru/images/docs/file/wotog.pdf
    • http://eia-edu.com/userfiles/file/munobiseteton.pdf
    • http://7sate.com/filespath/files/20210912132427.pdf
    • https://brihat-group.com/assets/userfiles/files/vevekavenupezixo.pdf
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/46441751325.pdf
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0ec68bac2122db11aac4db3290e764e3/kawozuzirolepezewasi.pdf
    • https://berettyotv.hu/userfiles/files/45962070091.pdf
    • https://ka-base.no/images_content/file/84905163354.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_off0000b945.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB945 16792 bytes
font_01_sfnt_off0000d15b.bin
55607a1eef188afa779ed3487e45a51379c8346427151d1d6fdbbc2c3b727fe0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD15B 9912 bytes
font_02_sfnt_off0000e761.bin
ea8ca97921d6e2417082148181e53b480f8b6291729f8054cc49ccac3b225c2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE761 19448 bytes

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