Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e27d5ec8452d650…

MALICIOUS

PDF

75.8 KB Created: 2021-09-23 23:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ea472bc9f44185e95373a566479c459 SHA-1: 52209cd9876620483eacead973bd1bd3cc0b9ae0 SHA-256: 8e27d5ec8452d650adb9ebc215e8122d1deb0bc1deb23f1ab5cfaa92e5195170
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs indicate that this file is part of a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453047d77c7---70624918596.pdf
    • http://wittymall.com/multimedia/userfiles/file/rixafumofeb.pdf
    • http://shangrilatheshow.com/ckfinder/userfiles/files/jitilizobijazum.pdf
    • http://straps.by/ckfinder/userfiles/files/tokapixabizapivig.pdf
    • http://autoklej.pl/app/webroot/media/files/52590038905.pdf
    • http://miyagi.chi-kara.net/Upload/files/31640152252.pdf
    • http://mathcountsoutreach.org/userfiles/file/27838407533.pdf
    • http://thepokewave.com/uploads/files/wiwojuvu.pdf
    • http://kovovyroba-nosniky.cz/UserFiles/File/taxusasajosejajemaxenu.pdf
    • https://superchills.com/userfiles/file/67104943009.pdf
    • https://mavibusiness.it/file/51629223951.pdf
    • http://itineraire-consulting.com/ckfinder/userfiles/files/rafivifuguvufemojinagirij.pdf
    • http://22vek-omsk.ru/fck_editor_files/files/posamuzeromofokuvu.pdf
    • https://ensegun2.com/ckfinder/userfiles/files/zokasezaviroruv.pdf
    • https://beautifulhairstore.com/upload/files/rexifajakisawugegizuj.pdf
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/25357986570.pdf
    • http://swatimishra.in/uploaded_files/userfiles/files/28165996808.pdf
    • http://traslochimontalto.it/userfiles/files/48026741876.pdf
    • http://cnpair.com/userfiles/file/15954242487.pdf
    • http://doubler-son-capital.com/photos/files/jasolafoj.pdf
    • https://hahapediatric.com/uploads/files/202109100623588826.pdf
    • https://chulintemple.house-well.com/CKEdit/upload/files/nuvuxumemezugudegina.pdf
    • http://simpelms.nl/userfiles/files/19203483123.pdf
    • http://iuf.kr/pds_down/files/balefuju.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=natural+vs+unnatural+bodybuilding
    • 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_off0000c6bd.bin
31b2092bd8b85bb4cbf4c0126a696d96274d51a4cc149707be69d26e16cb568e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BD 16672 bytes
font_01_sfnt_off0000f137.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF137 16792 bytes
font_02_sfnt_off0001094e.bin
bec9e6a64b76ef181fb2bd409947a91a99462a3bbf9985947c2ddf5292329a09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1094E 10688 bytes

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