Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa8c15621d0d77e…

MALICIOUS

PDF

85.4 KB Created: 2021-09-14 07:38:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4c80b91d41e1b95e6db242c22b2aadb8 SHA-1: 9a29a633dad8ac942a5280bf68bfd9d846a95e9a SHA-256: 3aa8c15621d0d77e9c91fe4c3d4c03cbc114ad2e02d43a1e1be0182f0a0301dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is a link farm designed to host numerous links on disposable domains, likely for phishing or malware distribution. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://miet-boot.ch/images/uploadedimages/file/meramifanarasogamulapa.pdf In PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/koxonaxorilawuvepop.pdfIn PDF document text
    • http://techbis.pl/files/file/11843345654.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/84896243052.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/kanagerovezazanodegixunuf.pdfIn PDF document text
    • http://vinaaquachem.com/uploads/files/45262231403.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/9906967530.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/xagetufulaga.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134b9d1b3986---nizexezetebipiboxofiwu.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/dusakemawanozeker.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/bowalas.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/84020450022.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/lekolaj.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/83619479281.pdfIn PDF document text
    • http://www.colormotion.cz/UserFiles/file/47648362440.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/5222248129.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/doxupixelibudokeji.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/xupod.pdfIn PDF document text
    • http://xn----dtbhwhggdaoqfh3d.xn--p1ai/media/file/70408273895.pdfIn PDF document text
    • http://nineslash.com/user_file/file/58663177485.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210903_324F5C866050FFD8.pdfIn PDF document text
    • https://topupdana.com/contents/files/14157560640.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/zopikunumirafo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=top+art+apps+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_off0000eb3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3B 17684 bytes
SHA-256: 461b96a39d0b15c0160f673eec43034398bfd7f4da0772f03496f67c3c142150
font_01_sfnt_off000118b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118B7 10276 bytes
SHA-256: 081630cbf8f5ce1dea952dc7730ee84a31e44dfa4ef8429eec08c5f821e10c5c
font_02_sfnt_off00012ff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FF4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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