Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4e601a86e2e0c3…

MALICIOUS

PDF

64.7 KB Created: 2020-12-29 20:41:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 899f0823b445c2f05e819baa53c5f5ca SHA-1: 7ded5dc6c4cececae16cfd7ea0dd29fe36eb177c SHA-256: 5f4e601a86e2e0c36044adca4133118b8646c15df31ebf988e9bf67b379c6274
156 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with multiple URLs pointing to external PDF files, indicating a likely attempt to manipulate search engine results or distribute malicious content. The presence of a critical heuristic firing for PDF_SEO_LINK_FARM and ClamAV detection as Pdf.Phishing.Trojan strongly suggests malicious intent. The embedded URL and the PDF's structure point towards a phishing or malware distribution campaign.

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/strik?utm_term=crafty+crab+sunrise+boulevard PDF link annotation
    • https://cdn.sqhk.co/vofaruvukuk/jgeghq2/starlink_battle_for_atlas_xbox_one.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387716/normal_5fde2dc41697c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402504/normal_5fb5f81e91861.pdfIn PDF document text
    • https://cdn.sqhk.co/zegetaru/bI4b7gg/zojarodajinosinu.pdfIn PDF document text
    • https://folukufisika.weebly.com/uploads/1/3/1/3/131384255/regobozagasi_pixuk_zipapafo_gipuxuxuvamovu.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/320dccc8-521e-457f-bf8f-23125aa0a953/actions_and_events_in_interval_temporal_logic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57ec89ac-e9b4-4065-900b-fa73c67088e3/58075709708.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd2f5a9e-d66d-45ff-a158-2ffbfae3d965/26695658241.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98d5db36-dbb9-42ab-9344-4935756c1df1/sulogefalowaxozimajo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d303b98-cecd-4877-a134-04468f65f8b5/non_compete_agreement_texas_if_terminated.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2260cda8-30c0-4a09-84d1-5ab4ba955749/ejemplos_de_aplicaciones_de_series_d.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_off0000c232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC232 5220 bytes
SHA-256: 92a55e042fe618138f8b9dbdbb9de43c47f554126ce00d8ae53854db9c873966
font_01_sfnt_off0000d40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD40C 9980 bytes
SHA-256: b5e601a122ec6ba22e9d6caf6c4995cfde943cf52ef373f0f14d1759c7f39f33

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