Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5a7903ffc99533…

MALICIOUS

PDF

67.4 KB Created: 2020-11-19 06:41:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 66656df640454814e1f4f73537262d38 SHA-1: 9a243fe2c330779f511052d27b82e628d7c53846 SHA-256: de5a7903ffc995330506d488606087197c72d3ebafa03084f0bf892cd9855fda
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm'. The primary malicious URL identified is 'https://cctraff.ru/strik?utm_term=eso+dungeons+by+level', which is flagged as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

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://cctraff.ru/strik?utm_term=eso+dungeons+by+level In PDF document text
    • https://fewevivib.weebly.com/uploads/1/3/0/8/130813821/1edc4e0.pdfIn PDF document text
    • https://kibodowusi.weebly.com/uploads/1/3/4/5/134588916/zapox-kibam.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/4f044a54.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421614/normal_5f9f1f6e31232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_5f9ab99bbc08f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387562/normal_5fa6005354bf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369318/normal_5f964aa69473c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373508/normal_5f92906dace6e.pdfIn PDF document text
    • https://fowalafe.weebly.com/uploads/1/3/4/7/134722097/5335438.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/e3a0cd50-3aaf-4314-a581-6e2dff0f3599/the_lions_of_al-_rassan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc31f38e-0a5c-47fc-8b0d-3da621f979b8/que_es_el_enfoque_formativo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b23ac36-95f4-44a2-a8b0-6d4a259dc10e/76507986192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed191cd8-ea98-4952-974f-572193768f5f/chemistry_chapter_11_test_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/adobe_reader_apk_file.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4af59971-a0ef-4124-b06b-469dd7c2101a/dalomudividuxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d409dde8-3c86-4e3d-a976-00ea4ea93578/2015_lexus_is250_f_sport_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61ae82f4-f7be-480e-8ea7-2a980fb0ea68/what_is_color_guard_in_marching_band.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_off0000cc7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC7B 4944 bytes
SHA-256: 881a22a149dd49335c001710b2b2e2c36691328a657360fe84834282258a6092
font_01_sfnt_off0000dd6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6E 10472 bytes
SHA-256: db5123de4f1a995aa7505e23b939873699a7c03f869d4804f927e53b6857d320

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