Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddd25fbe4c505c84…

MALICIOUS

PDF

78.1 KB Created: 2021-09-22 11:33:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 282fd2e9e1fb41a21df865f71117d6de SHA-1: 6d9bcf12c532885dace1e7bbb02154aef6e67990 SHA-256: ddd25fbe4c505c84ac9d0421a326d9bfdd0cb389ffcfe76c3c52ab3b2b29c843
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable domains, characteristic of a link farm designed to redirect users to potentially harmful sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to act as a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://sherwoodchamber.org/ckfinder/userfiles/files/patuvutugifes.pdf In PDF document text
    • http://nebovsem.ru/app/webroot/files/files/piwujolebazuje.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/1488094204.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/53193190146.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/41120104829.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/xufafoduvasuzufuwikelipok.pdfIn PDF document text
    • http://teifsepahan.com/files/file/44491176694.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/jasofusowogavatexumiwo.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/24f221f8dc87f3235879e4c51d2f9528/18969052940.pdfIn PDF document text
    • http://jeykrishnaclub.com/images/file/kiruzezenopigepokixamoxol.pdfIn PDF document text
    • https://oalysa.cz/ckfinder/userfiles/files/menuwixujagut.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/zuwebawiwupalos.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/22152161954.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/94479915228.pdfIn PDF document text
    • http://kahasat.cz/data/file/64640783616.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/82196212702.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/23583701138.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/17793130756.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/24842483966.pdfIn PDF document text
    • http://happy-land.hu/editor_up/nasirakivado.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/87946021181.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/zuzupamolesezakeve.pdfIn PDF document text
    • http://agilesolutions.in/uploads/36393985700.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/21401791155.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/wobolijibelaki.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/tiwipop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=synonyms+that+start+with+nPDF 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_off0000cea0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA0 17284 bytes
SHA-256: 156a7f536e689c9544845bc5911d9d1d767312b442ea8dbee9bdf1007ca87fd8
font_01_sfnt_off0000fb2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11343 10472 bytes
SHA-256: 473f1e0bf19646e69ecd29afc580247ad5d1ae74da4dc97c83295b894c88c921