Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3159f593d9fb232…

MALICIOUS

PDF

76.8 KB Created: 2021-04-09 09:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a843001ec1803c836491f284c098f480 SHA-1: 7a0866c32e68e5a262a6bde2943a820242654cca SHA-256: d3159f593d9fb2324b41deda5cf6d3723bb559dbebb996d7634605006370e1be
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a large number of external links, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The primary URL, 'https://xajibur.ru/strik?utm_term=washington+football+team+new+name+2021', appears to be a lure for search engine optimization, further supporting the link farm hypothesis.

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://xajibur.ru/strik?utm_term=washington+football+team+new+name+2021 PDF link annotation
    • http://stankoff.org/gisekasesoponebemozexopi9f40n.pdfIn PDF document text
    • https://vepodiruwa.weebly.com/uploads/1/3/4/3/134374194/fuwalino-kovupewanapo-xezopasuvipura-gorotebifaf.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/65046171107kjdv5.pdfIn PDF document text
    • http://kusafomidufe.mywebcommunity.org/xisak.pdfIn PDF document text
    • https://zarujiwimil.weebly.com/uploads/1/3/4/9/134900424/65797f.pdfIn PDF document text
    • http://onlajn-kassa.ru/modern_calculus_and_analytic_geometrykdojv.pdfIn PDF document text
    • https://sogifeni.weebly.com/uploads/1/3/2/7/132712483/6ed33b7804ae.pdfIn PDF document text
    • https://welirupew.weebly.com/uploads/1/3/4/6/134662060/6ac2044.pdfIn PDF document text
    • https://zevebijupaxize.weebly.com/uploads/1/3/4/7/134754497/7a4296082dca3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_5d59206a0cc54c559c4842e0b92608cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/robumuduluwise/cadbury_nigeria_plc_annual_report_2010.pdfIn PDF document text
    • http://pufalidupoge.epizy.com/bujadefivugiritexidewug.pdfIn PDF document text
    • https://4b523d79-2bc6-404f-8e52-0acae4d2cb03.filesusr.com/ugd/fe1b41_b9d31b8f23044da7a8101d5482b58111.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wezukep/pirixatuxopabasuvana.pdfIn PDF document text
    • https://9e2901ea-5d25-41a5-867c-54d0774c6e48.filesusr.com/ugd/4d0f37_704d8c35553d4c5380e08a17a36a4515.pdf?index=trueIn PDF document text
    • https://e1318bff-d970-45e2-bcea-45481503a18b.filesusr.com/ugd/75a96d_b6b33ee2130f44658d693ec2f39978f9.pdf?index=trueIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/solid_liquid_gas_worksheet.pdfIn PDF document text
    • http://nixesezamag.rf.gd/sidebuguniman.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_off0000ed01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED01 5656 bytes
SHA-256: ed096b66df6e0fd4f8b08b3378763440598d23dac4788613e97181ece2d98727
font_01_sfnt_off0001003e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003E 11052 bytes
SHA-256: 4e6d685d955dc308cff7be10edde382e5a99a3e1fcd7167e9111a246b07431ae

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