Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5002fdf2eaaaca9…

MALICIOUS

PDF

80.8 KB Created: 2021-09-19 11:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c2448f8711777e6b31a1f328c75bcef4 SHA-1: 50e47fb15939954e1fe65dd1e27da8013458833e SHA-256: f5002fdf2eaaaca9c574042bba495f4964f31d033c3e3cbf9280fe1b612fe3b4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are likely used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript is likely responsible for redirecting the user to these malicious sites, potentially exploiting vulnerabilities or delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://inwebjor.ru/uplcv?utm_term=watch+fear+the+walking+dead+season+6+episode+2+online+free PDF link annotation
    • https://tainandentist.com/uploads/files/202109071924449942.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210914101554.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/7679567293.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/wesigazavejol.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/84671718007.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613d059745acf---vetugux.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/talukibitupinebofojefas.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/nimijigob.pdfIn PDF document text
    • http://igigeothermal.jp/userfiles/file/63814564363.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/damamamuri.pdfIn PDF document text
    • http://alles-vom-schreiner.de/userfiles/file/31302086529.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/e2dc52ae45ad39c4917483fdef3146f3/25345994335.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/gamox.pdfIn PDF document text
    • https://topupdana.com/contents/files/zakoriw.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/75441968081.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/botijawa.pdfIn PDF document text
    • https://termofriz.rs/files/59406435626.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/zidedimiwexamo.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/putelokimozatalobariliv.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/46578105999.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16131a549491b8---zaviluzadebexogelovesifu.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/gulasodufozuma.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/vunugapinatamiw.pdfIn PDF document text
    • http://bolt-go77.com/fckeditor/userfiles/file/11143972530.pdfIn PDF document text
    • http://acunambalaj.com/adenoto/upload/files/nofidejejelogenavit.pdfIn PDF document text
    • http://mustang.tom.ru/jsplugins/ckfinder/userfiles/files/sijapuwox.pdfIn PDF document text
    • 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_off0000d5a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A0 17068 bytes
SHA-256: 80bcca6839e4c5254131e6e28be6d4f2d306c287448b0554361d6c415358b95d
font_01_sfnt_off0001020e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020E 11360 bytes
SHA-256: e5c7381f981e0aa18812f0248356c6e8dd04e5f3df88dd339a534c9134893b8f
font_02_sfnt_off00011cac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1