Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3bb0bdeca27f2e…

MALICIOUS

PDF

95.1 KB Created: 2021-04-13 19:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: f37d8c9822e2d93bc1e8559e02ed0aef SHA-1: 51162d57c5f2191fa3e2fb298ed2289d833ab71c SHA-256: 4d3bb0bdeca27f2eb317068ea0f3e9458a4ddd2c7c94e8461577c1cb9ea8bc59
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://baarspo.ru/strik?utm_term=star+chart+app+for+iphone PDF link annotation
    • https://foderojev.weebly.com/uploads/1/3/4/0/134041652/rajopu.pdfIn PDF document text
    • https://vokavize.weebly.com/uploads/1/3/2/7/132710687/todokovon_jawawaxexeti_tidik.pdfIn PDF document text
    • https://xumizobizuzu.weebly.com/uploads/1/3/4/6/134688834/virabiwape_bomutub_wutosiboz.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxujakosepa/fOghid1/95278327913.pdfIn PDF document text
    • https://cdn.sqhk.co/buzosefif/zhi4gc2/bigfoot_hunting_simulator_online.pdfIn PDF document text
    • http://prizinsta.site/how_to_take_call_forwarding_off_nec_phone280cd.pdfIn PDF document text
    • http://arenda-comp.space/modele_facture_auto_entrepreneurv33fo.pdfIn PDF document text
    • http://3-bureaureport.info/the_luck_factor_brian_tracymv5fx.pdfIn PDF document text
    • https://sarisakela.weebly.com/uploads/1/3/5/3/135308925/mamopakonenojejos.pdfIn PDF document text
    • https://cdn.sqhk.co/kurafuso/4igDjas/petisafexesir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://627f215e-41ba-4aa4-9906-5f9f9d117739.filesusr.com/ugd/8ab72e_37eac6748d2941af86a659b67308ad39.pdf?index=trueIn PDF document text
    • https://01d7ec8a-e38e-4e33-8c76-1be31754498b.filesusr.com/ugd/24d943_7aa8e1e62b944a4d81b803267a997254.pdf?index=trueIn PDF document text
    • https://4ad55601-b8ab-4ae0-bc0e-e90069072326.filesusr.com/ugd/3aca14_62d7451ca51e4008b9f1b651cb040432.pdf?index=trueIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_9cbaeda94c0944ddbf92e26c1a2993c7.pdf?index=trueIn PDF document text
    • http://vifajefowim.epizy.com/burger_king_chicken_fries_meal_calories.pdfIn PDF document text
    • https://0ed30ddb-3df1-4505-9e4e-3e87fc6d20ea.filesusr.com/ugd/f043c1_0d22fbb723cf4969ad70b4bd8b989b46.pdf?index=trueIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_98627e1ce3014904b279585e4cd95886.pdf?index=trueIn PDF document text
    • https://995be609-08d3-41b1-a6c0-90e53670bcec.filesusr.com/ugd/9988e1_648b50de135c4d31920cc257647dc434.pdf?index=trueIn PDF document text
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_e0a69941cc1e4d95ab0a98a7728a8d6a.pdf?index=trueIn PDF document text
    • http://vibofaser.rf.gd/60214278525.pdfIn PDF document text
    • https://fecd0c08-032d-4b8b-b26c-6108aca7a00f.filesusr.com/ugd/a87c8b_ad589eb44d384362a32bd28286a130d3.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_off000137db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DB 4996 bytes
SHA-256: 88ad0d20993f461527ba1aa259553fcd9cd7d0b1e77376d4732d75fcac33f9c7
font_01_sfnt_off000148d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148D8 11356 bytes
SHA-256: 22920e49a71d31777dcbd26666b7da145a6e28fa4efae16129a82f6900aa2a29