Malicious PDF — malware analysis report

Static analysis result for SHA-256 f495cda4db4ec3eb…

MALICIOUS

PDF

84.4 KB Created: 2021-09-02 22:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7e2b3ea0197e8b02f47cc5c7ac4e898e SHA-1: fa7d45a7197810eb1d0e0458035a72730146ef24 SHA-256: f495cda4db4ec3eb89d3ea70dfe3b9b9ade54b4fb56d67e6673c756a9cdeb955
142 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 are hosted on disposable domains, indicating a phishing or malware distribution attempt. The presence of a 'download button' heuristic further supports the lure-based attack pattern. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • 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 https://inwebjor.ru/uplcv?utm_term=ka+gavhane+chemical+reaction+engineering+pdf+download PDF link annotation
    • http://ausafe.net/images/art/files/gebevi.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/61490124077.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/86752579642.pdfIn PDF document text
    • http://kodemari.info/data/files/safamitugeguvufekopi.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/jebasakusazexoxa.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/gavuzakoxikiwufipid.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/3128130624.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/62854494705.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce65469201---48168866743.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/13088487837.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/genomolupa.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/50790837436.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/94777685197.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/fepus.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/72982664309.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/69726357182.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/kaxukugexapapebezap.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/b60a57c58bd59c0bac21da155d7cec6e/xesuvav.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/97364406934.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/27119227452.pdfIn PDF document text
    • https://olterus.com/contents//files/zufususefuworemugovufok.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/74515948996.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/kogadasojabalusojiripo.pdfIn PDF document text
    • http://feminella.ro/upload/fck/55155753805.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_off0000e542.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE542 17588 bytes
SHA-256: b57cfe34abc4bb5d2fc5c6264afb4a7ca49e54a96b6c099ab5f4c189d17157b0
font_01_sfnt_off0001124f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124F 11044 bytes
SHA-256: c477f7bdf798393aab3e3116f5f7662e787f58fb240cd2d23d46dc5e1d372aa4
font_02_sfnt_off00012ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1