Malicious PDF — malware analysis report

Static analysis result for SHA-256 8be3764b521dd60f…

MALICIOUS

PDF

83.0 KB Created: 2021-09-18 23:13:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6de7c4e55f3b7274da1055b81e6a1e63 SHA-1: 927a6ad22f3f82299e81e977909f2efa348185c9 SHA-256: 8be3764b521dd60ff4556bbbb53f80d262827ae2373afdce4720c2962137bf4a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to unknown domains, and one heuristic specifically identified it as a link farm on disposable hosting. The presence of external URIs and the overall structure suggest the PDF acts as a lure to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • 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://nothingbutsafetyglasses.com/userfiles/file/sozenilasoruliwaga.pdf In PDF document text
    • https://onsale.social-push.cc/data/fckeditor/files/43988016876.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/34066351305.pdfIn PDF document text
    • http://twilaw.com/files/files/17748504819.pdfIn PDF document text
    • http://hockeydh.com/files/ups/files/45334585932.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/neboxideso.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/6162892346.pdfIn PDF document text
    • http://mabifitness.it/userfiles/files/33081534417.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/69474622553.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/bawemafelomogi.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/kipuw.pdfIn PDF document text
    • http://etkindenetim.com/resimler/files/76248303786.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/50496389571.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/52427088178.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/kupuxezusok.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/punodunip.pdfIn PDF document text
    • http://17njl.com/userfiles/files/63170824090.pdfIn PDF document text
    • http://ccshecea.org/upload/files/18483707676.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/7de067cc675bef6bbd3af3ba35c3447a/66651741423.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/79125597321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=du+recorder+video+editorPDF 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_off0000d882.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD882 10052 bytes
SHA-256: df7ce832ba115a59c63a93f8e23c95e865cc85e1fc40effcfc6fe5f1464fec3e
font_01_sfnt_off0000eefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10710 21612 bytes
SHA-256: 7d1d3cd1462adda9cca304578d17aabda96d24675c16921c2335059fdefeefb8

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