Malicious PDF — malware analysis report

Static analysis result for SHA-256 f690f7c02faa32c4…

MALICIOUS

PDF

69.5 KB Created: 2021-09-20 15:30:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 32adac1fd86eae121a755d824794f24b SHA-1: 69dd39f7471dfb43fa272e70bd003d9023111462 SHA-256: f690f7c02faa32c4c1d2a97c8a45141d42142a307e4150d1ffd23ed141271c69
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. This script likely redirects the user to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic and the numerous unknown URLs extracted. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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 http://yejiya.com/userfiles/file/xizidu.pdf In PDF document text
    • http://grabnerestriche.at/tapanetoxifi.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/83531630451.pdfIn PDF document text
    • https://ispartaprefabrik.com/ckfinder/upload/files/92906620632.pdfIn PDF document text
    • http://kcemsp.org/upload/editor/file/59008948483.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/bawunupezenekazuk.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/34843135604.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/sanemujozikufomaso.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hb115pi9rdkui5ck82nv0h1582/24382217806.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210914070112.pdfIn PDF document text
    • https://kangaroovietuc.vn/webroot/img/files/73623937933.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/83888385972.pdfIn PDF document text
    • http://newo.ru/files/files/xupepo.pdfIn PDF document text
    • https://thehouseproduction.net/file/tuwisusedaxelasugorudukur.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/xiluzuvarupetokidosiruzoz.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a42e69006---xometebapab.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/39664584330.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/funuwigo.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/pelojaxekalabarepas.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/77919243773.pdfIn PDF document text
    • http://vetsnab32.ru/userfiles/file/79075957157.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/nebasojozuxoleb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+best+car+games+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_off0000ae8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c69d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC69D 15996 bytes
SHA-256: 434d3148146f52a4ad43c5957c4430821d3d39067e461116b292fffedf9cce04
font_02_sfnt_off0000ef91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF91 10980 bytes
SHA-256: 2f3cd52ee38a16e292760f9e20e4c33e78c756d712f27cbd291b88ac276fdfb8

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