Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c10e43e41d4bcff…

MALICIOUS

PDF

70.4 KB Created: 2020-12-01 07:19:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c455fc6e27c3d3537e9bb5daa5452a18 SHA-1: 77bdc163c04b9d5008148112a46e1c258dd05a33 SHA-256: 6c10e43e41d4bcffb04a552c504e52415dbdcb2a9f80a81b89f148761f766258
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The presence of the URL 'https://traffset.ru/123?utm_term=autosaver88+bull+bar' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm indicate a malicious document, possibly leveraging embedded JavaScript for exploitation.

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://traffset.ru/123?utm_term=autosaver88+bull+bar PDF link annotation
    • https://rixijufufapug.weebly.com/uploads/1/3/4/4/134497528/lifukupan.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/2d484360-e27d-41d1-a46a-18710281043c/ejemplos_de_mrp_resueltos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/365d26ce-5f7b-44bd-833b-55a79ca5e78f/winabupemazevodom.pdfIn PDF document text
    • https://s3.amazonaws.com/mukut/holistic_learning_theory_wekness.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f77b097-876f-4600-96ad-225d5f655886/41902144060.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/christian_academy_of_greater_st_louis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21d2a95e-2580-4461-bcc9-e5c05b4dc8cd/eso_torchbug_thorax.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc06ef3116eb00e3c49974f/t/5fc111e2e6d49a06bbb7bafa/1606488547187/fieldstone_golf_club_membership_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5e43eb6-7bf1-4fef-a27e-797f5e63b224/66987806644.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbfdc47a13a450babee0d2c/t/5fc1a766f8cdb769c621cb2d/1606526824099/base_attack_bonus_5e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4a92703-d6b1-4fdf-8d8d-7ce83bc5b1b1/fisotug.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe20dcf81c9a2a0c6b303b/1606295774087/97051935963.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5393013e-b67c-458f-8b4e-c9b890a4a08a/fisogun.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_off0000d6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F8 5060 bytes
SHA-256: b37674059fec8085cce75963d599931d93546a7cd4766e506fc3d9025088f069
font_01_sfnt_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 10800 bytes
SHA-256: f7f9f0eefeb5db9af5a2466ae931b614303d67efa4ccb76ec5966733d212dec2

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