Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe562f0555c2cf9…

MALICIOUS

PDF

77.7 KB Created: 2021-03-28 11:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7d04ec50ffe48a5717bf4b265ad49e0a SHA-1: 923fe3101160e08ac3bebdf42e450b8ebe5be890 SHA-256: 3fe562f0555c2cf9e0e1d1361bad665b6e6491fbd56c738908338d2c8c71feff
156 Risk Score

Malware Insights

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

This PDF file contains numerous external links, many of which are hosted on dynamic DNS services or personal domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the attempt to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/strik?utm_term=how+to+refill+ink+canon+pixma+ts207
    • http://simultaneously.space/80084421520avryg.pdf
    • https://zerakekume.weebly.com/uploads/1/3/0/7/130739742/pefumijulegof_visifunilebo.pdf
    • https://fakazurirogedim.weebly.com/uploads/1/3/4/7/134743668/xefarizigijolaka.pdf
    • https://lelusujizuzu.weebly.com/uploads/1/3/1/4/131438438/pizuxelimi.pdf
    • http://bamuwapinofaro.iblogger.org/85560736607.pdf
    • http://copyrightsupportforlnstagram.com/zadekos3yfvv.pdf
    • http://storeeuro.info/2012_chevrolet_silverado_1500_for_salelrwe1.pdf
    • https://nububoreral.weebly.com/uploads/1/3/4/4/134467099/velipitoruwoxofumeb.pdf
    • https://tewubituzidebu.weebly.com/uploads/1/3/4/3/134359488/zitewobezugetel.pdf
    • https://xolivura.weebly.com/uploads/1/3/5/9/135958321/gujef_dopot_tugol.pdf
    • https://lazibevuro.weebly.com/uploads/1/3/4/3/134345791/vomusezu.pdf
    • http://sarhello.online/jvc_mini_dv_camcorder_to_computerve3qi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://0d555108-1732-4721-8d72-76d747b2053a.filesusr.com/ugd/1b0481_356296789c724ffc8c374aed18c33efd.pdf?index=true
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_9d5e932c466b44bcb0cbcba63f6682b6.pdf?index=true
    • https://a9750898-a066-404d-a796-54a2f5ad13bb.filesusr.com/ugd/60231a_96dff15313274a54ae3d6e18632e761e.pdf?index=true
    • https://35e1cc1d-5f6c-4a41-9b1b-b9ae8dddc97a.filesusr.com/ugd/351eee_94147384bd9c453786978390214b80b2.pdf?index=true
    • http://sidijujaz.epizy.com/fugaxovo.pdf
    • https://s3.amazonaws.com/gogunabones/andhra_pradesh_state_formation_day.pdf
    • https://s3.amazonaws.com/gazitif/mitomex.pdf
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_5d1938eded0042dfa1f553b48ce64e19.pdf?index=true
    • https://s3.amazonaws.com/niporofez/persuasive_essay_examples_year_5.pdf
    • https://s3.amazonaws.com/sazomo/rujovasizilotet.pdf
    • http://jadizugexagosor.rf.gd/biology_in_english.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f309.bin
8d430ef595d0e1916090773f935760c94088d8e602db8969faa06a42704fa823		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF309 5700 bytes
font_01_sfnt_off0001067c.bin
15ce3f365e029e491d74b9a59e0815c76013cd0b521dedfaf35d785f974edf48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1067C 10168 bytes

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