Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f10df7122ffddbd…

MALICIOUS

PDF

99.0 KB Created: 2021-04-03 07:02:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8f59bbafa858c8f199aeac23f3c3312c SHA-1: 1cb2657115d64abbcbbf6fbf0ac3e76c7cd14f08 SHA-256: 4f10df7122ffddbdf0cc630e4a9e347d915c922f410132b7a27e3c709d18678c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, with several pointing to suspicious domains like 'pelibifir.ru' and 'arbitestpark.xyz'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The presence of numerous links suggests an attempt to direct users to potentially harmful content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://pelibifir.ru/123?utm_term=mailchimp+form+action+url+shopify PDF link annotation
    • http://arbitestpark.xyz/daxijuraruko8p8oe.pdfIn PDF document text
    • http://leadtop.co/700046022189s24p.pdfIn PDF document text
    • http://matteset-spon.space/alphabet_pronunciation_english1y6pj.pdfIn PDF document text
    • http://nesobaka3.xyz/wow_assassination_rogue_dps_guide1b8et.pdfIn PDF document text
    • http://texno3ua.com/15172382754wd0wp.pdfIn PDF document text
    • http://phulop.store/764169640354a7l8.pdfIn PDF document text
    • http://vertitribe.store/how_to_spell_egypt_in_hieroglyphicsc66ub.pdfIn PDF document text
    • http://ogranifruit.space/god_eater_3_outfitsu0h7g.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mipojumujudi.rf.gd/vivedofotogavop.pdfIn PDF document text
    • http://toxiramagelovit.epizy.com/how_does_directv_work_without_a_dish.pdfIn PDF document text
    • https://ee60c613-3dd1-430d-b711-08e3dcbf0273.filesusr.com/ugd/19ce5d_468229f1ef9c4e0e800621343ce84448.pdf?index=trueIn PDF document text
    • http://mikipifovusi.epizy.com/comptia_a_220-901_and_220-902_study_guide_free_download.pdfIn PDF document text
    • https://ec08fec6-e576-400d-8504-372613838d3c.filesusr.com/ugd/57e0ce_90a3950f0d5e4d06bc2094ec6e359847.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/72c8f809-a6f3-4b06-80bc-79ecb475b548/47883564024.pdfIn PDF document text
    • https://beea745c-e446-4317-9ad8-fe501d584c0a.filesusr.com/ugd/9196db_18b4a60b78a449c2ae1024cd012f2967.pdf?index=trueIn PDF document text
    • https://ef2e072a-e8a2-4438-804d-cc750be2e2f6.filesusr.com/ugd/6a22cb_0f7a54c6a9e345a9b1f0b7c3b8af9958.pdf?index=trueIn PDF document text
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_b403fab94bab430bb6f4ff2ed45a6cf2.pdf?index=trueIn PDF document text
    • https://ab0007c4-58ca-4db2-ab23-686bae4d53c1.filesusr.com/ugd/8bf248_0a87c795718b4e53bdc01d7285793d39.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a75e18c-3b99-4b75-ad2b-726d9eaee28e/ill_be_alright_without_you_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56fec3a4-eb91-41b2-9cec-6e2f93bd2335/2004_ford_focus_zetec_engine_diagram.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_off00014541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14541 5364 bytes
SHA-256: 266a4a20c363b269636473df0cf11cc48f0a5d89b85fc3070af19b0ec47cb78d
font_01_sfnt_off00015769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15769 11496 bytes
SHA-256: bc13f19485d06c6f88491b74d71a1ae4dda421f9008bf54104985aa53bb76818