Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb348f2225b06662…

MALICIOUS

PDF

77.7 KB Created: 2021-03-03 14:35:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 33320167317e4dc710d8e7254aaadd01 SHA-1: 4ea3eb1a25056faeba6b272f0618e09ead144fb7 SHA-256: eb348f2225b06662b189e59ef640aadde971a31405ebbf5cf3ad201e04295144
156 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, with one heuristic specifically identifying a 'PDF SEO link farm' pointing to 30 external PDFs, including 'https://s3.amazonaws.com/xeropizuwe/lewimiririlinuva.pdf'. Another external URI, 'https://xajibur.ru/award?keyword=what+does+it+mean+to+be+down+a+rabbit+hole', is also present. The presence of numerous external links suggests an attempt to redirect the user to potentially malicious content.

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://xajibur.ru/award?keyword=what+does+it+mean+to+be+down+a+rabbit+hole PDF link annotation
    • http://matteset-spon.space/tarelzp7q6.pdfIn PDF document text
    • http://openplafond.xyz/taurus_g2c_vs_g3_specspf32m.pdfIn PDF document text
    • https://xunopigiwigon.weebly.com/uploads/1/3/1/6/131636761/gubanemo-guwobofijux-lokilibu-sigabapize.pdfIn PDF document text
    • https://wizugelavuri.weebly.com/uploads/1/3/5/3/135325487/wowelol_kexitafi_badexupelewisiv.pdfIn PDF document text
    • http://pedalini.club/biminukobokulurodikiryq5z.pdfIn PDF document text
    • http://ionatr.space/small_incision_cataract_surgery_videohbl2d.pdfIn PDF document text
    • https://zapodebas.weebly.com/uploads/1/3/1/4/131437158/4488259.pdfIn PDF document text
    • https://rakulemuvi.weebly.com/uploads/1/3/4/5/134506415/3301639.pdfIn PDF document text
    • https://falaxejuwutop.weebly.com/uploads/1/3/2/6/132681153/sarebatubasodugiraz.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/cssxv.pdfIn PDF document text
    • http://semengergel.ru/98078988481dbooc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xeropizuwe/lewimiririlinuva.pdfIn PDF document text
    • https://s3.amazonaws.com/vapelurowar/axis_capital_holdings_annual_report_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/how_to_connect_router_to_rogers_modem.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/play_store_for_pc_direct.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/metro_map_istanbul_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/35069845309.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_off0000f147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF147 5308 bytes
SHA-256: 8c98e8f3b20e88bd7479c7bdcad05007860e0373da1d1d1136a497533577359b
font_01_sfnt_off0001033c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033C 11044 bytes
SHA-256: 7a17bca323cfb07edef6583989bdc4cfb012fbd395f192d1e3690802186093ab

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