Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ea34a45fd19592…

MALICIOUS

PDF

80.2 KB Created: 2021-09-12 14:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: de01a0ead4ec324fb6c36763947dbfa9 SHA-1: 85a494286de165887b40810a7187f09f11cb5527 SHA-256: 81ea34a45fd1959232cc44e7d833709a7521ad82a91a4c86242a155f10cdaa4f
174 Risk Score

Malware Insights

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

The sample is classified as malicious by ML and ClamAV, and heuristics indicate it uses embedded JavaScript and presents a browser extension installation lure. The embedded JavaScript likely facilitates the execution of malicious code or the download of additional payloads. The document's purpose appears to be social engineering, aiming to deceive users into installing unwanted software or granting access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://archism.ru/uplcv?utm_term=install+apk+on+work+profile PDF link annotation
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375f651b161---36301463335.pdfIn PDF document text
    • http://prmakeup.com/Image/files/zofutunejevaxopomozuvunu.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/6767967211.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/36078819039.pdfIn PDF document text
    • http://hasyo.net/files/file/97805405622.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/gaxulejikozifomusazedepe.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/pugub.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/24755004045.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/16458365129.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1613826be0ba1d---kumorufowed.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/50083442282.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/revit.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/zemipudufu.pdfIn PDF document text
    • http://pieseautocomenzi.ro/userfiles/file/70662125102.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/bosiwara.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/tizuvitonapugelowu.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/13597687122.pdfIn PDF document text
    • https://angkagenap.com/contents/files/77241085029.pdfIn PDF document text
    • http://cortocircuito.trialpanel.com/images/Upload/files/32255423240.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/59604531283.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/nudoradudojive.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/80134462752.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/gelelagotoluxavodapod.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/tejobotisofumanux.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_off0000d6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A4 17136 bytes
SHA-256: c348eb82a5d80c6bbe0205c54f4f3546d3328f70760acfbf08cfd724dec3787f
font_01_sfnt_off000102fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102FB 10480 bytes
SHA-256: 4a42b758ca691c7ddf16737e7cf50081439e0fcb2e8c502b680da3f3a930879f
font_02_sfnt_off00011b04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1