Malicious PDF — malware analysis report

Static analysis result for SHA-256 695d89bc450cdc95…

MALICIOUS

PDF

75.9 KB Created: 2021-09-19 01:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9dae491a676ea96b4fcd8ea76de3ccd7 SHA-1: 01c6cbfb2add4295e8d5142fd7b9394ada6c1e5c SHA-256: 695d89bc450cdc950729c1d5f516b1426b95a4fe2b06cf26e8e7408dc10f74c9
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 firings indicate the presence of external URIs and a link farm, suggesting the PDF is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly support its malicious nature, likely for phishing or malware delivery.

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.
  • 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.siphonicflowmandiri.com/upload/files/desusuradaneronawekisuzot.pdf In PDF document text
    • http://flex-link.cn/uploadfiles/files/95225633585.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/42398885562.pdfIn PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/gebigofaguxudewolira.pdfIn PDF document text
    • http://indianspringhomes.com/userfiles/files/jotojomumebidizijij.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/29246249158.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/bedame.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/fojepinukerizexirapari.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138e1ffe33a0---xutajenopamelukiwusisogek.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210911_4BE9D39ABAA33AE7.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/22539948381.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021091700010573499.pdfIn PDF document text
    • https://eniedu.com/data/file/20210915152318.pdfIn PDF document text
    • https://businesslife.com/content/files/84552309151.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/piduxego.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/bku3jekuumo77bnmc6sro6uf00/bukanawilodemusuv.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109151229057194.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/ditozojobokanog.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/31695718774.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/58081646861.pdfIn PDF document text
    • https://assignmentmart.com/ckfinder/userfiles/files/xenibubejijasenakunuki.pdfIn PDF document text
    • https://dp-engineers.com/admin/userfiles/file/12834744021.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/98892265766.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/fadinoxaja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=logo+quiz+level+2+logo+25PDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE358 10236 bytes
SHA-256: 6c48658cecf906b8dbe997743fa9932048b0ea011ec67b21e37cef1cca1d8da7
font_02_sfnt_off0000fa2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2E 15592 bytes
SHA-256: ba04da7de5202730a279e17fd42ac16fe7b30cdca86e9a29812c200773ffe17c