Malicious PDF — malware analysis report

Static analysis result for SHA-256 e356dcaf16e6275d…

MALICIOUS

PDF

84.4 KB Created: 2021-04-02 06:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0da717f866c01f17817cbf6b38416ec SHA-1: dc851b16496def6f8cc35a280caa3e659d3e7167 SHA-256: e356dcaf16e6275dda062befd6f928fe4ccacc6393ff1f70b4b5869c886d02ff
156 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 a large number of external links, many of which are likely part of a link farm designed to manipulate search engine results. The primary malicious URL identified is vilenefex.ru, which is presented in the document body as a result for "best logo making app for windows". No scripts were extracted, but the extensive use of external links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/strik?utm_term=best+logo+making+app+for+windows
    • https://butiriretife.weebly.com/uploads/1/3/2/6/132681404/77491b09.pdf
    • http://sifimomikev.sportsontheweb.net/calculus_and_its_applications_solutions.pdf
    • https://buralekareze.weebly.com/uploads/1/3/4/3/134326789/wukix-perovixu-nugemuxunu.pdf
    • https://cdn.sqhk.co/mijajijem/DhfhiiW/25441539368.pdf
    • https://cdn.sqhk.co/tarolaser/jjjc164/desafegaxoxutexemak.pdf
    • https://tidepobowajaxuk.weebly.com/uploads/1/3/0/8/130814761/viladopededapituxipo.pdf
    • http://makebugobiwuka.mypressonline.com/arm_cortex_m7_architecture.pdf
    • https://kexeretuzigu.weebly.com/uploads/1/3/1/6/131637303/82c52b.pdf
    • https://roxewakedenal.weebly.com/uploads/1/3/1/4/131483042/8245243.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://42172c5f-463d-425f-bc49-3536d5e9b788.filesusr.com/ugd/3e9aab_504f4569bb5d462d8f771d789404d12d.pdf?index=true
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_4a1aa79afd2d44a683f068fec683219f.pdf?index=true
    • https://6184de0c-c318-42a7-882e-c5ddc63b817d.filesusr.com/ugd/1c8c1e_f2577388e64b4df8bf6122b1a3653fc8.pdf?index=true
    • http://vakusidoler.epizy.com/51409170352.pdf
    • https://1a447ccf-a6a5-490c-ad31-399ae8169532.filesusr.com/ugd/cf5184_d47d2868b49c415da57ff25a5e5a5f31.pdf?index=true
    • https://8271b8e8-1520-4b18-8785-2fafc8cd33e6.filesusr.com/ugd/efc97f_f33a49f2c4584c9d85af93f1e32d459f.pdf?index=true
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_f5de5b47d1a54b2d943a072c71769827.pdf?index=true
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_5899cf103a1f46ddb6e90592dd3b3e5b.pdf?index=true
    • http://vasigitosiwow.epizy.com/polymerase_chain_reaction.pdf
    • http://xupevovegizem.rf.gd/scientific_advertising.pdf
    • http://xesijapapun.rf.gd/9978617411.pdf
    • https://95c758d6-fd33-43c6-b5d0-f1f55e07e946.filesusr.com/ugd/cb0188_6cf90c7be0e2479cb204f72335ee5b4c.pdf?index=true
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efb7.bin
745a59033351c142c379b227bc4715884cb402d419b5b8cf5af280b1dbcbf9b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB7 5564 bytes
font_01_sfnt_off000102a3.bin
79920e49e709b7de3976b2bb12c0e883b5f0e1ea580674cef0584268e5bbbabe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102A3 10768 bytes
font_02_sfnt_off00012796.bin
185e94e91edbb22fc2711a1b53e341597f8c64308630132e0ea837bbff9586ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12796 18032 bytes

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