Malicious PDF — malware analysis report

Static analysis result for SHA-256 860251b12261420c…

MALICIOUS

PDF

82.9 KB Created: 2021-09-18 19:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0b91d9b56ee838c9aa1460acb9880cd6 SHA-1: 671a402204f44ac8d917c620fd0e8b8f231b7ff4 SHA-256: 860251b12261420c2c457437ed44f4455077e97d282e97ac539271a5817fa911
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to various domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://oniceh.ru/uplcv?utm_term=avg+for+android+tablet PDF link annotation
    • http://szentistvanpatika.hu/upload/file/zuletufuxomekolelatox.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/fosixufir.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72129951790.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/34357022867.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/96446429765.pdfIn PDF document text
    • http://sirindhorn.net/upload/File/91364847205.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/80523031354.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/vegupub.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/72857641678.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/nizumavefasakifavag.pdfIn PDF document text
    • http://biemmecommerciale.eu/userfiles/files/99284638328.pdfIn PDF document text
    • https://bak.vn/upload/files/zadirokadotate.pdfIn PDF document text
    • http://metabolit.ru/files/file/gakoge.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a2d197d89---62817041045.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/73305332238.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/wurure.pdfIn PDF document text
    • http://cudicio.it/images/file/81786408545.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/9032596349.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/88657807848.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/92312157163.pdfIn PDF document text
    • https://majubesar.net/contents/files/69735750264.pdfIn PDF document text
    • https://flomogroup.com/upload/files/bogafiwufizuzabujenef.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/sokiwepuvupajujevewo.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/75472504745.pdfIn PDF document text
    • 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_off0000e0b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B2 10548 bytes
SHA-256: a64751ab2818ad9da2c50ef2e33397e59324e2f1472db893ffdcbf72d1e063a3
font_01_sfnt_off0000f8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B1 17616 bytes
SHA-256: 8dfe705eec9f5389a44d79179bc6e377c0a2213db6e8cff0d4189413fa47c6fa
font_02_sfnt_off00012650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12650 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1