Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f49db3e8ca6be5f…

MALICIOUS

PDF

63.2 KB Created: 2020-11-30 20:44:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 0ac08b74f66f0d6b15ec92195c8959be SHA-1: d9f4ffa365b12d82cf5d122ae40f3e28684c09ba SHA-256: 9f49db3e8ca6be5f9ed8a4efaad4087bd4687d09e68ef8c4b22775fe9f67f626
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 0.9998

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://traffine.ru/strik?utm_term=chicka+chicka+boom+boom+printable+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4466146/normal_5faa8af402a2f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382193/normal_5fb5f3cc9e9c7.pdfIn PDF document text
    • https://voledobaseju.weebly.com/uploads/1/3/0/9/130969813/339999.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474989/normal_5fa6eb49975a4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492901/normal_5fb71ff4544f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365600/normal_5f8f61b63f4c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428331/normal_5fba2bd175464.pdfIn PDF document text
    • https://kudigebudubug.weebly.com/uploads/1/3/4/3/134353201/555268c13f49d.pdfIn PDF document text
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/sakodopoxiluwat.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387928/normal_5f9f71de158b5.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/naxizugenabi/90077983923.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/69014493854.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/asymptotes_solved_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/train_sim_world_2020_pc_mods.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_off0000b8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E0 5328 bytes
SHA-256: 4c3ff030b35827dda6c91f80ef36a84026a28d1214dcd70050579f1b88924743
font_01_sfnt_off0000caca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCACA 10864 bytes
SHA-256: 035886f65691c19ca0f4f655d1d5f644a45b26aa861be2f333d4104041f67fea

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