Malicious PDF — malware analysis report

Static analysis result for SHA-256 84b77b6bc02e52ce…

MALICIOUS

PDF

79.0 KB Created: 2021-04-15 09:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 361312206fffdcc4a78b354fcfa95ddf SHA-1: 27eff73240e05a1cf75ddbb60dc3122826e78f4f SHA-256: 84b77b6bc02e52ce3d28be2323c59f065c3177e1105e8c48ddc9e0dc1ad30228
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, directing users to potentially malicious websites. One critical heuristic indicates a direct link to known malicious redirector infrastructure. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=star+trek+technical+terminology In PDF document text
    • http://bopolubolef.mywebcommunity.org/rejefijutozogoteluboza.pdfIn PDF document text
    • http://juvizex.sportsontheweb.net/wokevevijejogijom.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/absolute_value_function_transformations.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/iikbDIl/debemawutoma.pdfIn PDF document text
    • https://cdn.sqhk.co/nixivezez/jaidqic/zivusimiriviru.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/02e395da-0e96-41f7-86df-ff7db7940cb1/65641368415.pdfIn PDF document text
    • https://s3.amazonaws.com/gozifep/43167063419.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/la_esposa_que_ora_internacional_blog.pdfIn PDF document text
    • https://s3.amazonaws.com/xonobijikivo/24675233776.pdfIn PDF document text
    • https://6d4cd3b7-91e9-43ac-92b9-205473f1e50d.filesusr.com/ugd/28146e_3c6fe5322d294f2bb2a3746422a8a94b.pdf?index=trueIn PDF document text
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_1f5d82f1b93d4830a62c520f3410ff07.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tapexiw/lutuweto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa9b543c-ca07-44d4-bc25-683cbcc22aa5/lalis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c24c46b-cde8-45e3-8701-ad7bf28b342a/when_to_use_single_quotes_for_titles.pdfIn PDF document text
    • https://b6086c54-8ef4-40f3-ba18-bbbb993b339e.filesusr.com/ugd/36e927_5d5c2e2bb49d4318b8a2e6ac376b9514.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/doxifuba/what_are_some_heart_medications.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15284ba6-748a-4748-bed6-a63a8b7e7261/computer_hardware_engineer_education.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/196cb4b0-53dc-40d3-bc30-5ee08295b0f0/libibuxiruzikorijo.pdfIn PDF document text
    • https://s3.amazonaws.com/padanivozeb/plural_possessive_nouns_worksheet_answer_key.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB29 5092 bytes
SHA-256: 5e1e7e6198e2d5aefa3df7a0dd4cea7736a93e95b1d051a2c343e4f2199393b6
font_01_sfnt_off0000fc3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3C 10664 bytes
SHA-256: 76c27f7069100d03f59eb7613b0eec597a8153af2c2255404f62d355b5c9ad45
font_02_sfnt_off000120a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A5 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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