Malicious PDF — malware analysis report

Static analysis result for SHA-256 c545b9e71a1b662d…

MALICIOUS

PDF

93.9 KB Created: 2021-05-11 15:01:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 13521fed5c8834923f4a6dbcf61689d7 SHA-1: 412d46ac497827349477e46d6e5b4fc4719768d1 SHA-256: c545b9e71a1b662d8474572957166ddb62032d412f140fef5af284da0d9fb5a9
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external URIs, 'https://soxebez.ru/strik?utm_term=how+to+make+a+scale+rc+car', suggests a lure to a malicious site. ClamAV detection and ML classification further indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/strik?utm_term=how+to+make+a+scale+rc+car PDF link annotation
    • http://motivawka.online/88028511290gu35k.pdfIn PDF document text
    • http://coloradocustomelectric.com/18617516882v8wyh.pdfIn PDF document text
    • http://nesobaka7.xyz/79957249179uvuyn.pdfIn PDF document text
    • http://buwubaled.mywebcommunity.org/diwozatafuxavupim.pdfIn PDF document text
    • http://powerhdniy.space/petudoxolemo72kaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fosawef/kufemoxenizuxirurade.pdfIn PDF document text
    • https://fe92b815-f0fe-4223-924b-659339f44b90.filesusr.com/ugd/8f64fc_cce0236e4d7d4f7a8620fd8d9c2ec775.pdf?index=trueIn PDF document text
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_edfb05d809474818a290bf729aabbf8b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/xogogisesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc0bed10-18a0-4def-bccb-822a99ea999a/2013_dodge_avenger_4_cylinder_hp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/522baa93-7b85-40a0-9bed-2cab1a636ceb/how_many_carbs_are_in_a_sonic_junior_breakfast_burrito.pdfIn PDF document text
    • http://zaduzos.myartsonline.com/definition_of_business_research.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/wojuvijoririkeke.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/graduation_award_certificates_templates.pdfIn PDF document text
    • https://98748e4b-3258-471a-903e-8ea98415cca0.filesusr.com/ugd/fd7405_ce62059e5e514011a42b9aec5f36307a.pdf?index=trueIn PDF document text
    • https://03a45e23-20c9-4b13-8d21-50c2609e56df.filesusr.com/ugd/502f3d_3a446149b1f14616ad2387e73788a6b1.pdf?index=trueIn PDF document text
    • https://965bd944-310b-4209-a71a-d16e45aaced4.filesusr.com/ugd/5f02e6_564dba90d7824386ae48ade56cd5cba6.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000131d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D1 5064 bytes
SHA-256: debcdb41fd506668970c46317e9e788c8b79f49d8d490d97fc7c31d14389b879
font_01_sfnt_off000142ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142FF 11144 bytes
SHA-256: 1c112ccecec6ac06174384db1973ba936e1220fcfe2c804bc849fba211a8ad61

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