Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af8a9a700472db4…

MALICIOUS

PDF

70.2 KB Created: 2021-01-01 03:15:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: db3d52e2c41acc022db4701635652c61 SHA-1: d21a797828474aee19b88854ad5fd893f98adeee SHA-256: 8af8a9a700472db42bddb2887f3151bf97b1af3b826ac6ba29d1b880d6e1c296
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document has been identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing trojan. It contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and link farm indicate a malicious intent to redirect users to harmful content.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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=la+jarra+de+buen+beber In PDF document text
    • https://cdn.sqhk.co/bizufunido/azviilu/tidamevo.pdfIn PDF document text
    • https://cdn.sqhk.co/vunelebu/eBgcXhg/66407575443.pdfIn PDF document text
    • https://cdn.sqhk.co/govovazeket/RZJrjib/my_oldboy_gbc_emulator_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/disegivoji/UjcWtgh/kafanajiki.pdfIn PDF document text
    • https://bujezabuzi.weebly.com/uploads/1/3/4/3/134310034/dd7bf75b7.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/0977d74c-cd4d-4e7b-b5bf-d2b598ad5a63/posie_en_sortant_de_l_cole.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/adobe_after_effect_2018_crack_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sepawi/9657244745.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/formaldehyde_material_safety_data_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce21ac40-12f4-4842-b9e9-da29403a3334/john_berger_about_looking.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/dmv_test_2019_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed9f8e0f-c0ac-401b-be99-1399e68095bb/rusudazimepagumilip.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/professional_skills_resume_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/265080d3-eb27-4203-8e85-b710c417bb90/farmville_2_cheats_trainer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3641f962-f251-4c45-b3c8-5e0a3615f893/dewulivenodutiranu.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_off0000d45c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD45C 4764 bytes
SHA-256: 160561bf044fbe0b4e8eedd037113198db63c0acc671e8da656b5a446b782cdf
font_01_sfnt_off0000e49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49C 11720 bytes
SHA-256: cf2bf22faf163fe7bf68a6c0750c058bfe7941a54cab29f297d9977f0acfee27

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