Malicious PDF — malware analysis report

Static analysis result for SHA-256 a989984aba22ca5a…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 11:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1d0c2ac04fb456d04e17dfa9eb3bc520 SHA-1: 39f876d3c02681f4ae9941742d1cef2721cba0c0 SHA-256: a989984aba22ca5acdf471d6257b3ae4b34d536d70a1d931a9155886720d5130
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. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of external links, suggesting a phishing or spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • 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.
  • 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://reaga.net/js/ckfinder/userfiles/files/54186303124.pdf In PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/65768971652.pdfIn PDF document text
    • http://smartraoptics.com/fck_filemanager_upload/file/16526769368.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/keremefiwew.pdfIn PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/90276635674.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/beginepam.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/pubafapux.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/17715942029.pdfIn PDF document text
    • https://abcoegypt.com/userfiles/files/31457297720.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161416594ef40c---fufegi.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/qkgbcpusrijbjhmfho32o2v8h6/97690448844.pdfIn PDF document text
    • http://boston.pl/fck_pliki/file/82250589726.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/zaxozobulejokutu.pdfIn PDF document text
    • https://blugarden.eu/file/lepor.pdfIn PDF document text
    • http://bibikid.ru/upload/34230349255.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/19005520715.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/37555246235.pdfIn PDF document text
    • http://d-innovation.com/upload/files/pojelotosirolojirig.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/dufalasila.pdfIn PDF document text
    • https://cs168.tw/upfiles/editor/files/rapukolotujilaxifebexa.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/21147186973.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/71438032311.pdfIn PDF document text
    • http://makesrealsense.com/ckfinder/userfiles/files/livasad.pdfIn PDF document text
    • http://retrofotr.cz/files/file/59815409399.pdfIn PDF document text
    • http://deforma.it/userfiles/files/79775384540.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210911174802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=baseball+superstars+2011+apkPDF 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_off0000d407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC19 18836 bytes
SHA-256: fe7bf91db6af4f24c5b2e447d5aa2a66a7c8f8104b2280d12b7d20510097ac10
font_02_sfnt_off00011d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D55 10608 bytes
SHA-256: 3515097acd0f290bad80a598155646c085234578f95980f428a524b816d539e8