Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8552c7967c19465…

MALICIOUS

PDF

77.1 KB Created: 2021-03-23 10:32:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7b5f9e3b6d31f5c0fd2ab61b2ab9fda2 SHA-1: 57ff99aef16353173c481485bc5ab6ebd3167e33 SHA-256: f8552c7967c194658e5ecb99701bcfb55f0672ad7072a7055bf4e8bbc65db321
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://xezojetit.ru/wix?keyword=kindergarten+sight+words+list PDF link annotation
    • https://vijopafixav.weebly.com/uploads/1/3/1/6/131636601/d5b51191dd61d2e.pdfIn PDF document text
    • https://xotomunekezej.weebly.com/uploads/1/3/1/0/131070571/newes.pdfIn PDF document text
    • https://lutokiwepaje.weebly.com/uploads/1/3/4/2/134266006/8624747.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/djicJhf/kediguwojali.pdfIn PDF document text
    • https://malosopiwa.weebly.com/uploads/1/3/2/6/132695478/risonipu.pdfIn PDF document text
    • https://cdn.sqhk.co/wojipezusax/gMggigd/emergency_alert_app_for_elderly.pdfIn PDF document text
    • https://ritojajugub.weebly.com/uploads/1/3/5/9/135984917/rafix_bolifa_sekizoxuf.pdfIn PDF document text
    • http://aycotoro6.xyz/toro_gts_6.5_clean_carburetor3dorj.pdfIn PDF document text
    • https://cdn.sqhk.co/liritefebat/hwm0ugc/joregisola.pdfIn PDF document text
    • http://avtoshkola-region26.ru/dasokevixobagujizemyd09c.pdfIn PDF document text
    • https://gadebalemalun.weebly.com/uploads/1/3/4/4/134443756/8269192.pdfIn PDF document text
    • http://stc-l.ru/wojojexu3uut.pdfIn PDF document text
    • http://vorgazme.com/redi_check_thermometer_probewmroh.pdfIn PDF document text
    • https://baxelawinojiw.weebly.com/uploads/1/3/4/3/134333718/zodinek.pdfIn PDF document text
    • https://cdn.sqhk.co/jomububorava/1Zjdhjf/39168297340.pdfIn PDF document text
    • https://woxufojobufuv.weebly.com/uploads/1/3/0/7/130739326/3283399.pdfIn PDF document text
    • https://cdn.sqhk.co/rubupidorinu/bhihajd/lovecraft_country_hbo_cast.pdfIn PDF document text
    • http://mail-autoscout24.net/speak_laurie_halse_anderson_essayztsi5.pdfIn PDF document text
    • https://xezinaruwi.weebly.com/uploads/1/3/4/4/134479948/3949984.pdfIn PDF document text
    • https://ludurodeb.weebly.com/uploads/1/3/4/8/134852143/221422.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/laradusa/49176504392.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ecb54f8-d050-4296-b0a2-442dd3c41961/hedgehog_book_characters.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/79732684947.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3866994-fcbe-4861-a571-db530d83faac/43277081912.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/hypertensive_crisis_guidelines_2015.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/91723869244.pdfIn PDF document text
    • https://s3.amazonaws.com/wibadinavosunom/75716289952.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_off0000ef62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF62 5148 bytes
SHA-256: 88cf2e83dfbd9010839a5432da3a6a3b45afea85fed909159cb81a20a7b79850
font_01_sfnt_off000100f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F7 10904 bytes
SHA-256: 8abc08b1177f06b1476e2e113f312cfbacb3afaeb5ab4347dde98c846825c955