Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c83e3b46caca51…

MALICIOUS

PDF

76.6 KB Created: 2021-03-09 16:24:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d87e927c724580211816f23be264ed81 SHA-1: ee5b5b9d470908a9685566500c5bc5f22d1515b1 SHA-256: 65c83e3b46caca5158dcdf36df834eaa8c3c3abcb1b4f5f88d43084ead495837
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO manipulation tactic. One of the primary URLs, 'https://ponafet.ru/123?utm_term=growtopia+fish+feeding+guide', indicates a lure related to a game guide, likely to attract unsuspecting users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/123?utm_term=growtopia+fish+feeding+guide
    • http://kimidenexikox.getenjoyment.net/who_manufactures_ducane_furnaces.pdf
    • http://tesugujinarijag.mywebcommunity.org/artist_management_for_the_music_business_fourth_edition.pdf
    • https://static.s123-cdn-static.com/uploads/4463287/normal_5ffab0e1b3efa.pdf
    • https://cdn-cms.f-static.net/uploads/4490364/normal_601e116239f6b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8d684a1e-4078-49cd-b336-05adf09473b6.filesusr.com/ugd/2b25e8_d8385fdefa954f3a96c27edc318e203c.pdf?index=true
    • http://wupigokoravu.epizy.com/zojapuzuwotinixix.pdf
    • https://s3.amazonaws.com/xilasisefi/59362542351.pdf
    • https://s3.amazonaws.com/potamotaz/80701418122.pdf
    • https://d4508431-0eee-4913-ac2a-2ec907ed9b18.filesusr.com/ugd/12daa7_bf9919eac6154af3a1ae7d1912ec6831.pdf?index=true
    • https://s3.amazonaws.com/bajuse/xiwotipina.pdf
    • https://s3.amazonaws.com/topipovikapari/36085876109.pdf
    • https://s3.amazonaws.com/kexamoxusinixu/bildungsroman_novel.pdf
    • http://pekoguwomigurup.epizy.com/aptitude_test_papers_and_answers.pdf
    • http://jisukizopupez.rf.gd/mugogaju.pdf
    • https://s3.amazonaws.com/muwomapotumugi/49479487647.pdf
    • https://c580675e-8888-491d-8c80-3106eaac86fb.filesusr.com/ugd/c8a981_61da6be692594bfaace459a780304fca.pdf?index=true
    • http://nogomazarem.epizy.com/tcp_ip_layers_and_protocols.pdf
    • https://s3.amazonaws.com/poresi/form_design_studio_chicago.pdf
    • http://perexuwofogefo.onlinewebshop.net/kaxudewuzaxawojufexotu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • https://instagram.com/teryjaki/
    • 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_off0000e878.bin
56977c008931db8bca8a7b8d8d7ee9f6582635ddcd50e61170691d9e5230efec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE878 5392 bytes
font_01_sfnt_off0000fae8.bin
4c6c108800f71d19db64337ce16de750fa5805f81fc8dca1a96bc6e027cb7963		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE8 12008 bytes

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