Malicious PDF — malware analysis report

Static analysis result for SHA-256 91daf9dcb9323439…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 19:58:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7187daa6fd9d062c22855b084696f444 SHA-1: 72929f92c0122ba72b70069dd8f6c7c191f7206c SHA-256: 91daf9dcb9323439c695cead4db63389205307d9d86a86a291481e77a20fcbbe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML and ClamAV as malicious, with heuristics indicating embedded JavaScript and a link farm structure. The PDF's content and numerous external links suggest a phishing or malware distribution attempt, likely leveraging the embedded JavaScript to initiate a malicious action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.vandiestbrandstoffen.be/uploads/files/43769845756.pdf
    • http://synowka.pl/galeria/file/44031501572.pdf
    • https://leciv.fr/uploads/FCK_files/file/topujapojevax.pdf
    • http://022-web.cn/uploadfile/file/20210912063228363.pdf
    • https://299-45.com/CKEdit/upload/files/mumururaridugafewaxabedo.pdf
    • http://kapelski.pl/userfiles/file/gilimisitebofepelipanorap.pdf
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/21690595802.pdf
    • http://markone-tools.com/upload/files/tibukimugerojumema.pdf
    • https://dalycity.com/wysiwygfiles/file/papuxibo.pdf
    • http://petukmahaaaraj.com/userfiles/file/43928752307.pdf
    • https://gbagencement.fr/uploads/file/66666239384.pdf
    • http://fukaofoods.tw/uploads/files/202109030537378021.pdf
    • https://trimix.bg/UserFiles/File/32758070807.pdf
    • http://aroma-es.red/yamituki-n/uploads/files/40817380220.pdf
    • http://brukikostka.pl/uploads/page/file/65962612350.pdf
    • http://auto-rad.pl/userfiles/file/xanodaxeguwodikiwomafopon.pdf
    • http://hhsmelt.com/upload/files/71954705100.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613370a861001---50355765395.pdf
    • http://geyikkimya.com/userfiles/upload/file/wivezuvidafowuj.pdf
    • https://esz.jp/img/editor/files/muxofafomakikabebulix.pdf
    • http://simsvizag.com/admin/uploadedfiles/file///tewovamikukutawid.pdf
    • http://avanti-kuhni.ru/upload/files/biraxikujaluwuse.pdf
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d770dc6cd2---42236422251.pdf
    • http://files.ibiza-ferien.de/file/fituroxurozadelelirivika.pdf
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/84613154762.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=redmi+5+roms
    • 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_off0000dff7.bin
21e5f249bee7e720a8c412af775aac31636ca01286c8fdccda409d2b0095d600		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF7 19020 bytes
font_01_sfnt_off000111d9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 16792 bytes
font_02_sfnt_off000129f0.bin
cbba707ccd7aa48afe781dbeb3b2102f5f0f900e6ad05f5125473945a1c5a813		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129F0 10176 bytes

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