Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b381731f0facc9f…

MALICIOUS

PDF

58.6 KB Created: 2020-12-16 04:25:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: c89bee95bc348f69b1af6a26d2718019 SHA-1: b1c83974e96cedbaf4f91f60c9823dff1ae27c56 SHA-256: 9b381731f0facc9ff6972ed38ce66725bafc752aefde29019bfc150ee7d51be9
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external URLs, 'https://traffset.ru/strik?utm_term=mccurdy+charter+school+staff', is flagged as unknown reputation, suggesting a potential malicious destination. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffset.ru/strik?utm_term=mccurdy+charter+school+staff PDF link annotation
    • https://xopavomubikun.weebly.com/uploads/1/3/4/8/134879687/8590708.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389104/normal_5fb2943eea9fa.pdfIn PDF document text
    • https://xulajaxosu.weebly.com/uploads/1/3/4/3/134366267/xiweporo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cadb4f3-fca6-4724-a97b-38ae7e1dc994/new_balance_mt610.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0fa6e5e1-4626-4e4a-a4a8-19623e8c8955/pugilist_armor_class.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/tegoguzanorekubaxu.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/restaurant_guide_michelin_indre_et_loire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cfabd8e-aae7-484c-a075-de21fca438f5/2267812449.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/putalagufud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78b54a2c-cded-402b-a4ca-a9e00e79a031/mebozafaruka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe447202-6509-4579-83a8-d4544b5713af/pocket_points_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28b7ca37-90f2-4196-aefe-c83f644af452/fekaritafewodo.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_off0000a9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA9EF 5216 bytes
SHA-256: 052c8f74601d0d99996ebd423b8f1b55d2023cbe6327c9476a861ac1dc3ad632
font_01_sfnt_off0000bbbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBBB 10300 bytes
SHA-256: 8c1b13d1d3d7aa31516fe05aa8ed9115d05c27c179139943a5fa055f72c6ac77

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