Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e23dab5cc2516c…

MALICIOUS

PDF

78.9 KB Created: 2021-04-03 15:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 843b9c904eeba25bdcb82e0ea01a3c26 SHA-1: 78166034e64f1417d9ced58ff850842ab2166081 SHA-256: 83e23dab5cc2516c824961d30fb684a9953258393837991c2dc08955c056fe51
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. It contains an external URI pointing to 'maypoin.ru', which is likely a phishing or malware distribution site. The PDF also exhibits characteristics of a link farm, suggesting an attempt to generate traffic or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/wix?keyword=algebra+1+common+core+regents+january+2016+answers
    • http://pasadurasasagi.medianewsonline.com/47895172472.pdf
    • http://myshoes.moscow/analisis_del_manifiesto_comunista_de_karl_marxa9ojs.pdf
    • http://smirno.life/the_cradle_the_cross_and_the_crownbwgoq.pdf
    • http://drive4mclaneaustell.com/tixenativekimih2q5u.pdf
    • http://antonioit.fun/breeds_of_sheep_in_nigeriajw2hp.pdf
    • http://pozijuza.scienceontheweb.net/solving_cubic_equation.pdf
    • http://trikolor.site/98384033219vo6j0.pdf
    • http://ziwusis.getenjoyment.net/bunegev.pdf
    • http://zokidinodajives.getenjoyment.net/the_aleph_in_the_mirror_page_37.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/dafc3c65-cba2-4cce-bb30-539d2b8de625/what_percentage_of_each_hogwarts_house_are_you_quiz.pdf
    • https://uploads.strikinglycdn.com/files/3a036a1c-b5a2-4390-af89-f027a249dcd0/python_for_kids_udemy.pdf
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_0bf0393dc445403abb28aa8d9be4d5df.pdf?index=true
    • https://s3.amazonaws.com/bipovoromoj/how_to_soft_reset_a_samsung.pdf
    • https://ddd90330-5837-4e0c-b2f6-9383941cd2db.filesusr.com/ugd/568e2c_6e190e276fae4774b6daaf9ab2ec9fc8.pdf?index=true
    • https://d05b2b94-0af3-401c-a6ef-75d00d0b58ae.filesusr.com/ugd/3bca44_2be0a5b8dd75425d88beda5bc067bc15.pdf?index=true
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_37fb684496ff42828b602d3dd8c00b44.pdf?index=true
    • https://uploads.strikinglycdn.com/files/e1601d07-0be6-4eb0-9c57-62d3eadd5ce6/68082893385.pdf
    • https://070488ba-e3d9-4c74-834b-445551f5513c.filesusr.com/ugd/fb83f1_926afb05a5064e46b7f02810107ef724.pdf?index=true
    • https://d3dd75b0-514a-4dbf-a1f7-973a5b421fb1.filesusr.com/ugd/5b46ec_4b1dccf69a4848268d946482d0b20c60.pdf?index=true
    • https://s3.amazonaws.com/pisik/53611492022.pdf
    • https://uploads.strikinglycdn.com/files/d690edf4-9b39-49e4-9bb0-91aeb421c0bb/7450122119.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f40a.bin
6fbc398ee4d4fb6a677e5e07fa044496a8d579789acb5bea1c92eb63eb23224b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF40A 5996 bytes
font_01_sfnt_off0001087f.bin
c390f78493d0999272fb1d71e8fa504fe712194c4d8962b27aedf6b50ac6aadb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1087F 10900 bytes

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