Malicious PDF — malware analysis report

Static analysis result for SHA-256 73780c6a0934a30b…

MALICIOUS

PDF

142.8 KB Created: 2021-03-25 11:45:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ce4423e241d2158641ac6ecaebe53d8 SHA-1: 7e699fb4c1da431e1a306ef45b6611b5c04777c6 SHA-256: 73780c6a0934a30ba812a695fd05c24db31494107b3df3d39d388f1c1f58fa58
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to various PDF files, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this as a phishing or malicious PDF. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/award?keyword=english+words+synonyms+dictionary+pdf
    • http://funasowuto.getenjoyment.net/banking_and_financial_terms_for_bank_exams.pdf
    • http://zapitexidij.mypressonline.com/psychology_books_for_beginners.pdf
    • https://laxonetamaj.weebly.com/uploads/1/3/4/0/134096763/cc068b76.pdf
    • http://faxifebusen.iblogger.org/78705688872.pdf
    • http://kazonikaxa.22web.org/vidunev.pdf
    • https://voduzivet.weebly.com/uploads/1/3/1/6/131607522/8036093.pdf
    • http://lexisunat.iblogger.org/old_john_deere_riding_lawn_mowers_for_sale.pdf
    • http://lajazakabe.iblogger.org/xokabaduri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://s3.amazonaws.com/rutufokedizon/breville_juicer_bje820xl_manual.pdf
    • https://s3.amazonaws.com/vibasujefir/fepixemifozugufi.pdf
    • https://s3.amazonaws.com/ritoma/45727459415.pdf
    • http://gumofiwulova.epizy.com/37993036714.pdf
    • http://dexadusoxeb.atwebpages.com/briggs_and_stratton_20_hp_v_twin_oil_filter.pdf
    • https://s3.amazonaws.com/xutomoxu/n_s_d_c_ka_full_form.pdf
    • https://s3.amazonaws.com/wupiwupiwot/92576017718.pdf
    • https://s3.amazonaws.com/woxewiwupir/63159957739.pdf
    • https://s3.amazonaws.com/zidosozawok/arabic_malayalam_learning_app_free_download.pdf
    • https://s3.amazonaws.com/tamobalasu/keliz.pdf
    • https://s3.amazonaws.com/dojivewobasuval/pepunajukukutaveda.pdf
    • http://mupufuten.epizy.com/ama_bibliography_format_website.pdf
    • https://s3.amazonaws.com/mukut/71357203629.pdf
    • http://gizimup.epizy.com/ronoxidot.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b27a.bin
0a04218fc0ea6770d5da52509539b970ab5fa6f1fb45607ee566f48d1e4eeded		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B27A 7284 bytes
font_01_sfnt_off0001cb6d.bin
ff45327ba12d2a53c0f128960942de6c93a39476971a6d42b228612cc7cdecde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB6D 5720 bytes
font_02_sfnt_off0001decf.bin
08d960f23cf71323de7753f9840b8b102e67d2f004b923d9a53a51bd5a1e25cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1DECF 8204 bytes
font_03_sfnt_off0001f5ba.bin
6770d34b1912b2b0c959d6ce484d15bd7c4e928e55247a1715a212f47f89c92d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F5BA 17936 bytes

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