Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a3bc14e6412f797…

MALICIOUS

PDF

76.7 KB Created: 2021-04-06 14:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 4585c1d20393a625a661d94ceb0239cb SHA-1: de126edba2bd6a0dde518a4954a31be0fe2cbc9d SHA-256: 1a3bc14e6412f79786586a01601e940ab95b6ee5e13bbde8db6961e21096a8a3
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The presence of a malicious ClamAV detection and a high ML score further indicate malicious intent. The primary malicious URL identified is https://jacksth.ru/strik, which is likely part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • 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://jacksth.ru/strik?utm_term=nustep+trs+4000+heart+rate+monitor PDF link annotation
    • https://besuweleterum.weebly.com/uploads/1/3/2/8/132814030/59f0f11b9b94c92.pdfIn PDF document text
    • https://kamararexunazo.weebly.com/uploads/1/3/1/4/131453861/waxipolobufeduk-tifek.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/icijjbw/effortless_mastery_espaol.pdfIn PDF document text
    • https://pefizisiguxuv.weebly.com/uploads/1/3/1/4/131438819/2302575.pdfIn PDF document text
    • https://cdn.sqhk.co/vitikitema/57fhfJo/kenekagitogamamatoxin.pdfIn PDF document text
    • https://wagimudo.weebly.com/uploads/1/3/4/4/134475497/1407680.pdfIn PDF document text
    • https://jerexibim.weebly.com/uploads/1/3/4/6/134654770/6494107.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5a060084-92f5-4e09-b02e-bbac8bb45871.filesusr.com/ugd/05c943_2190f8a4e44943da8a7997437e8945de.pdf?index=trueIn PDF document text
    • http://vurefubopixutap.epizy.com/components_of_functional_foods.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/advanced_excel_tutorialspoint.pdfIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_905bc6d8999840c897d07f56584d4fef.pdf?index=trueIn PDF document text
    • https://bac325b5-3710-4a60-ba01-c1ac5e8a7650.filesusr.com/ugd/c111de_101f54344dfa456aa6bf281b537f79b1.pdf?index=trueIn PDF document text
    • https://0a01f052-6ee6-4bfa-868d-d2e49373b03f.filesusr.com/ugd/55f640_e8cd90ec1b044cd38feb832653dc8ec1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/gogerow.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/adobe_animation_software_free.pdfIn PDF document text
    • http://pipixaf.rf.gd/voduredilonikigudaziwab.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/cancer_de_cervix_sintomas_y_signos.pdfIn PDF document text
    • https://s3.amazonaws.com/mejados/sepotajefurin.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/mametotakotuj.pdfIn PDF document text
    • https://s3.amazonaws.com/bulozor/28044289010.pdfIn PDF document text
    • https://s3.amazonaws.com/sojuravewi/beats_studio_headphones_wired_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/instagram_frame_template.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/what_is_1_of_1000_dollars.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF4 5228 bytes
SHA-256: 76457ede3e7d8eb6767e60a63d712c825b043c24263ce8920721faa864525e7c
font_01_sfnt_off0001019c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019C 10756 bytes
SHA-256: eef33584192711a6d4fbb34256adea2e1ecac5dd133ab32ad84839560875665d

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