Malicious PDF — malware analysis report

Static analysis result for SHA-256 3afec8423ccfbe85…

MALICIOUS

PDF

81.4 KB Created: 2021-03-19 17:42:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 06c915e0bccd728bf61f9dfec7de3fd4 SHA-1: 9a4277c1cab8dbd4fe3f09db5e3e19213002a17a SHA-256: 3afec8423ccfbe857b943fb4ea23d289a20790f6f0f5a3a03da4d0487a93ebaa
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains numerous external links, many pointing to disposable hosting, suggesting a link farm designed to distribute malware or phish users. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a fake browser update or extension. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://soxebez.ru/award?keyword=assessment+form+for+physiotherapy+pdf PDF link annotation
    • http://top-odejda.com/jalakedanojotujyiam4.pdfIn PDF document text
    • https://tazipapanora.weebly.com/uploads/1/3/0/7/130776418/fukobiwuji_wavojizafinale_jekapitamugow.pdfIn PDF document text
    • http://216tilford.com/install_acrobat_reader_chrome_extension_downloadf4v7n.pdfIn PDF document text
    • https://mixuzurul.weebly.com/uploads/1/3/2/3/132303374/kiwedamovemal-riveletigexu-fakix-denazib.pdfIn PDF document text
    • https://bogibopedazite.weebly.com/uploads/1/3/4/0/134018154/jubegaxiborepadun.pdfIn PDF document text
    • http://dololebajug.scienceontheweb.net/49518783672.pdfIn PDF document text
    • https://tosixugiza.weebly.com/uploads/1/3/6/0/136052785/8911453.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ef3f611-c3fc-4a6c-a33e-e59b788089ab/10348494980.pdfIn PDF document text
    • http://rukosivujuxu.atwebpages.com/pukadebadimezudotup.pdfIn PDF document text
    • https://d3df31c7-72fe-42b1-a92e-0723e8ed7a16.filesusr.com/ugd/5bf82b_61fcb900e22b46cba66b5c3696d782ed.pdf?index=trueIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_a96c2a41bc78411787848383e8cd4e00.pdf?index=trueIn PDF document text
    • http://fedonefekipide.myartsonline.com/common_noun_worksheets_for_grade_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/080fa7c3-010c-484d-91f3-d38fbed93a86/lisugedewiseferotumux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a103eb7a-873f-4984-9c8a-e5c08ef55301/is_project_management_institute_accredited.pdfIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_5052f17afc7e422695c8331bd485ebf5.pdf?index=trueIn PDF document text
    • http://sakogabutal.onlinewebshop.net/84301969933.pdfIn PDF document text
    • https://acd80754-3b70-42c6-a60f-3489f6261da4.filesusr.com/ugd/f1780b_d5204932c4ba4337bfe100cc934d7be5.pdf?index=trueIn PDF document text
    • http://riveminigokoxa.myartsonline.com/7469587047.pdfIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_e775c3616cbb437f994263dba9c4b4e6.pdf?index=trueIn PDF document text
    • https://1b6fbac1-9b66-4609-9151-81f5d4c316f7.filesusr.com/ugd/5e81b9_884a7f1a28f046169f77ce198627c037.pdf?index=trueIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D4 1888 bytes
SHA-256: a153f2b82b35c1aa971c18884fc3c9e6340e625a5f18cb09ea0ae4c0610b7973
font_01_sfnt_off0000ffc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC0 5340 bytes
SHA-256: 79ed8a199f2442f442d429e935da516f9e4af3892f8274d0adc263676e941e3c
font_02_sfnt_off000111cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CB 11232 bytes
SHA-256: d4a0f053cad0c909eaa383f9406860a24242f62d92270a4fde3664316c2ce643

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