Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4cf3991eb20498d…

MALICIOUS

PDF

70.9 KB Created: 2021-03-08 12:21:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 087e78ea2ec614726884670f7d035bfa SHA-1: 29477746f86cfdf7a6a1dbb25e1d17a505fbd6fa SHA-256: b4cf3991eb20498d8068b29b7cac14cb587afa978131fba495ef34d22464d69e
184 Risk Score

Malware Insights

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

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 0.9338

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.
  • 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
  • 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://baarspo.ru/award?keyword=compress+pdf+to+smaller+size+free PDF link annotation
    • http://idealicaitaly-ufficiale.site/mepetuxonobodibhitiv.pdfIn PDF document text
    • https://cdn.sqhk.co/delobepaziw/hifn5ja/microsoft_sql_server_2014_books_online.pdfIn PDF document text
    • https://tuduzijusesuzi.weebly.com/uploads/1/3/1/4/131406801/5578250.pdfIn PDF document text
    • https://cdn.sqhk.co/mudifuto/aiitZu0/10830655890.pdfIn PDF document text
    • http://libertinemodels.com/17447287078k7dmd.pdfIn PDF document text
    • https://cdn.sqhk.co/livukigelo/gahfgcR/sugeradez.pdfIn PDF document text
    • https://cdn.sqhk.co/jeporikate/Arsjfif/mealworm_colony_setup.pdfIn PDF document text
    • http://neo-tp.ru/fs-ia6b_sbus_connection6hvp3.pdfIn PDF document text
    • https://cdn.sqhk.co/guwewaxa/chS9ify/84141747392.pdfIn PDF document text
    • http://motuxagajoweji.22web.org/6125880575.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/EAjCihj/wechat_app_for_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/ihhjoXM/littlest_pet_shop_1284.pdfIn PDF document text
    • https://nawobelif.weebly.com/uploads/1/3/5/3/135307193/mexewesefan-kajibipu.pdfIn PDF document text
    • https://cdn.sqhk.co/pofifarim/hbejiny/5308480322.pdfIn PDF document text
    • http://tdsevsvet.ru/binapejufuxamukigufujaluwylgde.pdfIn PDF document text
    • http://matras-24.ru/data_analysis_definition_sociologyhz3tu.pdfIn PDF document text
    • https://cdn.sqhk.co/toromerepowa/gjcjiic/83746113776.pdfIn PDF document text
    • https://wifaborasumekig.weebly.com/uploads/1/3/2/6/132695644/wofoxadefu-xaguvezowafapub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://witigunakejawi.rf.gd/67253484998.pdfIn PDF document text
    • http://giwuvupajot.epizy.com/how_to_loosen_tight_elastic.pdfIn PDF document text
    • http://gotejeje.epizy.com/philip_morris_international_annual_report_2014.pdfIn 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_off0000dec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC4 4944 bytes
SHA-256: acaf508eddab567a63f69221a743f305f0b7514c511a5bbd3fde2a5bf861da8a
font_01_sfnt_off0000ef97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 10508 bytes
SHA-256: 005eabdd52489a2260023ccde3849fbd2e32c045948a4433150c08c001764f89

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