Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5fc9b0657fa654…

MALICIOUS

PDF

65.0 KB Created: 2020-11-17 00:07:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: bccecc16cd0bac7f19524fd1c8caee13 SHA-1: 5c7829ff2961825c86c2b6985081e6cfe0b7467f SHA-256: db5fc9b0657fa6547a463656e6ce64e30384749957b92c00a27b25eeb1cd3778
156 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 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://traffine.ru/123?utm_term=tectonic+plate+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365998/normal_5f8773cce6e83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370056/normal_5f957e5c5dd57.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373770/normal_5f8f56a86de49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_5fad851b4c9a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416332/normal_5f9ac0e342778.pdfIn PDF document text
    • https://mepafuxutare.weebly.com/uploads/1/3/4/6/134660934/1816054.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/b2596e62-c5c1-4597-8b56-132710404dc3/satune.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e10391a-805c-42be-9c04-cbd19922111c/felopapafaxokela.pdfIn PDF document text
    • https://s3.amazonaws.com/wexukufedepim/papa_louie_3_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1246bede-894a-420d-acde-7eeebc57ffa2/legal_billable_hours_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/201d47ef-cb63-4d8a-b4d2-cd0222498a6f/basezaz.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/smash_bros_flash_2_unblocked_games.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_off0000c3cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CB 5124 bytes
SHA-256: 276da52dc394c17a252acbe18851e5ac6a1acb648588e9ff85da9b48947f5dae
font_01_sfnt_off0000d546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD546 10044 bytes
SHA-256: b6b16d8c59c1f3511ff6a323d95f2f41d977bba1076ae3543e63316e7ef314b3