Malicious PDF — malware analysis report

Static analysis result for SHA-256 96ba54c81ea59429…

MALICIOUS

PDF

90.2 KB Created: 2020-11-18 08:54:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 3b0c52154c66980c228ff4282f34b567 SHA-1: def02d57964ba16de32a7c74d10a8276c8a7d9d6 SHA-256: 96ba54c81ea594291fb9307df30d836843ff1fd0227e82b8c9cc0b060da1d075
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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=isothermal+transformation+diagram PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448724/normal_5faf8296aa9e5.pdfIn PDF document text
    • https://mamunazeve.weebly.com/uploads/1/3/0/8/130814121/6fdf5fb01.pdfIn PDF document text
    • https://direnebem.weebly.com/uploads/1/3/4/6/134641367/tuxaxiwiriv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405179/normal_5fac537312f2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368493/normal_5f9046cfd08c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379240/normal_5fac2d97e5811.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410206/normal_5fae0ff33620a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393751/normal_5f9ae4908e16f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387698/normal_5f93c2bd86477.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414848/normal_5fa42b51e5d9f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b83402bd-c850-4612-bfaf-81ede6a54157/84665964461.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49ccde2e-fbf4-4a30-a1de-33b84b357e96/tadigisapovubovexunodep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9f3229f-ec6f-4da6-a8c5-7b657cdeb87d/85253858226.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbf5f493-f774-4395-8d21-0a40e5f27641/myers_social_psychology_12th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86e2c05f-fbab-4b5f-99d5-47534f3a35fe/examen_de_espaol_segundo_grado_de_s.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001111e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111E 5044 bytes
SHA-256: 206a6c62bc296184244b809a9741bdad5b2dd758c831a19c55b980c884ccc50c
font_01_sfnt_off0001220f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220F 13368 bytes
SHA-256: 19c41d45461a5acd74046545935f3a7b36efb98ff29f812d5f58b981271c575a
font_02_sfnt_off00014d35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D35 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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