Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b2631aadbc16aa9…

MALICIOUS

PDF

85.0 KB Created: 2021-09-03 19:43:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 30f914f2649cf4d4d3a4cd435b2f2275 SHA-1: bb63d7e87b28877a664d6e258e2aed2d639bbdbd SHA-256: 7b2631aadbc16aa9c3e9c58ca269a751b2c6b7a4a1ed4b871e931c231ea47138
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs are consistent with attempts to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://xlsferrosilicon.com/d/files/96319200189.pdf In PDF document text
    • https://grandplaza.bg/uploads/assets/file/musaxomisaluzuxegidavis.pdfIn PDF document text
    • https://birudongker.com/contents//files/gaxexefijikafe.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/rofuvasezi.pdfIn PDF document text
    • https://edgecs.com/documents/70305456010.pdfIn PDF document text
    • http://itineraire-consulting.com/ckfinder/userfiles/files/gegimivajazut.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/xijomebuguperotunofin.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/zapopenuwezumibelitewor.pdfIn PDF document text
    • http://schubert-hh.de/image/file/54230169786.pdfIn PDF document text
    • http://harrisonfamilyreunion.org/clients/868801/File/vaxetimudedofuvirirepobod.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/77402853334.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/pemaxetetafuxepetipap.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/45826850829.pdfIn PDF document text
    • https://majubesar.info/contents//files/25021822460.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/d0aggv56sbhtp40b7eklos0iv7/67406366881.pdfIn PDF document text
    • http://zamel2.pl/userfiles/file/wopipit.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/84898965705.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/gofobomeluropotokixitus.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/62202656714.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/tuwijezorojuzegejitekoxu.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/19071465194.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3130d50aad---87630095952.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/85027563793.pdfIn PDF document text
    • https://oferta.lt/i/File/87777381737.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=rapidex+english+speaking+course+tamil+book+free+download+pdfPDF link annotation
    • https://cakamuzejs.riga.lv/ckfinder/userfiles/files/47531326728.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_off0000df29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f73b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73B 19236 bytes
SHA-256: 7cfb3507a213b1664a67bbc8dc00dbbcecb136d2b9b37b85989270fae3a9cced
font_02_sfnt_off00012a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0C 11632 bytes
SHA-256: 2b5b14da59eb2c6dd952dc5d42a744fb9cd48ee10bff1d0256344a918960c48d