Malicious PDF — malware analysis report

Static analysis result for SHA-256 00164da6ab06e73e…

MALICIOUS

PDF

97.9 KB Created: 2021-09-18 03:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c839a5c0abe3374caa04e0b5354dc704 SHA-1: ee94ade8d27f54417bc6c011f6ebea5f29370427 SHA-256: 00164da6ab06e73e1f2731c306ae14409d371132ae036c8ce07eb22a44bddff1
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier also flagged the PDF as malicious with high confidence. While no scripts were explicitly extracted, the presence of many external links suggests an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 4

  • 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://raljob.com/userfiles/file/niripikopawo.pdf In PDF document text
    • https://cremyco.com/app/webroot/docs/file/6520312789.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/83666563680.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/runiruregomofizam.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/megijimefap.pdfIn PDF document text
    • http://dichvutot99.com/webroot/img/files/17962485591.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/13219094894.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/8843994186.pdfIn PDF document text
    • https://ist-lb1.istanajp.com/contents/files/36012487318.pdfIn PDF document text
    • http://www.siposferenc.hu/html/38242378416.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/lokomevatuzex.pdfIn PDF document text
    • http://jainfarms.com/uploads/49521524134.pdfIn PDF document text
    • http://agarimo.com/archivos/archivos/78882469941.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143f402e2eb1---bevapekapik.pdfIn PDF document text
    • http://orosweb.hu/ckfinder/userfiles/files/72090582205.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/12603006214.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/xaniwidigax.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/15359538883.pdfIn PDF document text
    • http://geologicatoscana.eu/userfiles/files/57379244087.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/lilibijositug.pdfIn PDF document text
    • https://maymac.info/userfiles/file/xawekaduguxavimenukaza.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/fupizij.pdfIn PDF document text
    • http://xn--80adic7alej3d.xn--p1ai/userfiles/file/72625255388.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=ps2+emulator+games+apkPDF 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_off00011806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11806 18940 bytes
SHA-256: 3a704b485ea0dbb77584c4e2d7619008a314ecafbafeb9141251724beaa2565f
font_01_sfnt_off00014982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14982 10712 bytes
SHA-256: a8099f71c225b86d1a427319429c55afab4e248e975dcd31407954ab354e100a
font_02_sfnt_off00016252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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