Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f4314e1eb62adb4…

MALICIOUS

PDF

72.4 KB Created: 2021-09-24 21:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 01f2b931fae4ba882a5cae40f7dc740f SHA-1: dcf58885ee79f1d9eaea26e9c3624f54b70f1308 SHA-256: 7f4314e1eb62adb4b8df449be6b1f543237946d15ea3df35e718f06bbb54e574
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs, including a link farm hosted on disposable domains, suggesting an attempt to redirect users to malicious content. The `wkhtmltopdf` authoring application and the presence of embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 https://medvor.ru/uplcv?utm_term=laptop+not+seeing+iphone+hotspot PDF link annotation
    • http://geasit.it/userfiles/files/rerebazisunabeworumipid.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/32231114180.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/dowozozarebixixorokalub.pdfIn PDF document text
    • http://dmkert.hu/files/file/83941495693.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/lakujefogasakolex.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/47107105831.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/39151718406.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/wirobebijulokozavuputapa.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/bewinuwubazeteduwevuxipe.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/22645820303.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/25668476954.pdfIn PDF document text
    • http://agrion.org/upload/fichier/15561777723.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/kopores.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/79072772875.pdfIn PDF document text
    • https://rt-totaalafbouw.nl/userfiles/file/38110687150.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/49063697628.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/magagojumixikerawejok.pdfIn PDF document text
    • https://idealist.ro/userfiles/file/kenefababalapegi.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614775a6a32f9---91770304188.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/bobapunetameni.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/xonig.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/28011917713.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/15100667965.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/zokadaketaturidugudoku.pdfIn PDF document text
    • http://bdsductri.com/upload/files/54982972093.pdfIn PDF document text
    • http://scpt.it/userfiles/files/dumirizenipedirapidevemo.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_off0000b77b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB77B 10340 bytes
SHA-256: c9f86e50bba9f65c1c3ded582b1892eedae1614ac831af3a90a41909a6e143b5
font_01_sfnt_off0000cece.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E0 17732 bytes
SHA-256: 6cf4554e8c9c69c07a0c58a1df08fd738b0955bed9be338c0e43dda5a638648d

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