Malicious PDF — malware analysis report

Static analysis result for SHA-256 966da5b92654e1b9…

MALICIOUS

PDF

75.0 KB Created: 2021-09-18 04:49:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e1c1adbbd5e693cff5e0532ea5a0003f SHA-1: 3800963c5bd25cae929ec645d2f0959effda0ab8 SHA-256: 966da5b92654e1b95eb680e0513c687c66de9ca08932825eb35ae6d0d85db295
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The presence of embedded URLs further supports the attack pattern of luring users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://philabc.ru/uplcv?utm_term=simply+piano+premium+mod+apk PDF link annotation
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/miwope.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/96877725894.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/dolurizolizarutolop.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/55159213705.pdfIn PDF document text
    • https://udruga-invalida.hr/files/86686976910.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613f3623f1d9d---49609650790.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316949a4166---beketewiw.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/bitofapixaroxu.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/11996018556.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/kofolajo.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/donixososexazesujagug.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/jipek.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/fuvexebewu.pdfIn PDF document text
    • https://guptajimarriagebureau.com/userfiles/file/zenugusad.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/14232691503.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/lirezakes.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/40512652440.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210912095534_1963156273.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/xijerifukabuxezonewevaki.pdfIn PDF document text
    • https://e-room.co/userfiles/file/55600859556.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/51614677373.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/94856909018.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/koreden.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_off0000bb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31C 10668 bytes
SHA-256: 6c0391b3721b177865d0e607065f10ed68c54da88860eccf7faaf8d208111c85
font_02_sfnt_off0000eb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB79 19396 bytes
SHA-256: 27a80e1cb6c7a6c5466b5518927d56455249a4eaea883377deec537521e368c5

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