Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5466d8aa0856e0…

MALICIOUS

PDF

88.6 KB Created: 2021-09-21 06:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 93569ea0803ec600ddace3468ed30d9f SHA-1: 9f5284d1f67cc081e35d6cc64f5c35d405c7b759 SHA-256: 6f5466d8aa0856e09066a7feeb56b1f0b78eb9a16aa9b6cfe19cd571314001f8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs, many of which are hosted on potentially disposable domains, suggesting an attempt to distribute malicious content. The presence of a 'download' button heuristic further supports a lure-based attack pattern. ClamAV detection and ML classification confirm the malicious nature of the file, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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.psyforyou.nl/upload/fckeditor/file/sagodowaxomibofo.pdf In PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/uiu2dtujkvsplrgqh5e73dkp7d/89210322413.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613743f2ab55e---futubuvijiruvasoji.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/163197788943.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/90844053856.pdfIn PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/80117676742.pdfIn PDF document text
    • http://geoman.cz/data/file/39591739333.pdfIn PDF document text
    • https://corpeverest.com/ckfinder/userfiles/files/nanilawoxixegeme.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/1429700557.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/fovuwavufun.pdfIn PDF document text
    • http://seritour.com/rsm/files/7029492376.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/40810254136.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/rajinigabigakedajutoju.pdfIn PDF document text
    • https://novinfasteners.com/userfiles/file/78431326916.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/filowutelixido.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/raludalumujujotame.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/raseku.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/73630334507.pdfIn PDF document text
    • http://toyotarent.hk/FileData/ckfinder/files/20210901_19CBC390640B4BDD.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/99525850047.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/lujizojuvexet.pdfIn PDF document text
    • http://denetimmusavirlik.com/userfiles/file/wazexesaguxonorobajak.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109042346515130.pdfIn PDF document text
    • https://ximangcampha.vn/upload/files/vuvazu.pdfIn PDF document text
    • http://chia4kids.ru/ckfinder/userfiles/files/dijulomaga.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/48231988746.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/60635251910.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=wwe+smackdown+vs+raw+2009+game+download+for+androidPDF 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_off0000f332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010b44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B44 17904 bytes
SHA-256: b2ff1a7bb36e04a79777d10c466fd166ee10a20638bcff489c105b6a0182ac9f
font_02_sfnt_off000139a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139A5 11368 bytes
SHA-256: 1a9d3d8cdb867bdf8839c3be2b4e5c9356961d1079a75350f12f5dd99ae6f987