Malicious PDF — malware analysis report

Static analysis result for SHA-256 56abff91699fcd8c…

MALICIOUS

PDF

85.0 KB Created: 2021-09-22 12:10:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: bb82fa21d0824d166ef3d3debf24e6c0 SHA-1: 7eba742b2554325eb6796b7bed7eac0dba93f33b SHA-256: 56abff91699fcd8cbb1d485e3b5ff03948a3e199cd0a1deb3b2c8d69e9346c32
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs, many pointing to disposable domains, and one specifically uses a 'utm_term' parameter suggesting a phishing or spam campaign related to game downloads. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://www.champagne-auge-dascier.com/ckfinder/userfiles/files/87413386491.pdf In PDF document text
    • http://megaprestige.ru/uploads/files/13821470963.pdfIn PDF document text
    • http://elsped.hu/files/file/49470604791.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/87145051705.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fde224247---lajixuzetiw.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/gaposalimepekuxowupak.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/7975716427.pdfIn PDF document text
    • https://badeluxe.com/userfiles/files/ripotakilasibodisujaf.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/45181800194.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/taweposa.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/riwebifodasutavuduxu.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/wokulatuvejoxipizajifara.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312f633086a---12212792265.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021092215221473499.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/26043991564.pdfIn PDF document text
    • http://identik.hu/editor_up/56513318991.pdfIn PDF document text
    • https://kinhdoanhvaphapluat.com/img-dn/files/tufakekilopokabalorazo.pdfIn PDF document text
    • http://skupka23.ru/upload/m/jalaxatuxozevurox.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/37041878732.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/44158182334.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/33065705308.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/takezafasesun.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/5840325013.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=gta+free+download+mobilePDF 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_off0000e844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE844 17888 bytes
SHA-256: 829af9f03adc374d8223eaee9781d0f47d9180209fb4d7826383eef76400cc3f
font_01_sfnt_off0001166c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166C 10612 bytes
SHA-256: 6a891968f27e81a357d0f4eb4ac2281f2d9c149700a0f836f30688d8fbb07678
font_02_sfnt_off00012eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1