Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4066a2fae8b5b4c…

MALICIOUS

PDF

70.2 KB Created: 2021-09-18 10:55:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9e7716885fd65470358b5447fbd4bd55 SHA-1: a8ccce4824dfdaa6d34a18149614e5e11059c613 SHA-256: b4066a2fae8b5b4c4b241d47d16ee035a4320fb320425c6b1db2efe77929e939
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be disposable or used for hosting files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to redirect users to a large number of external sites, likely for malicious purposes such as phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 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://smidgel.ru/uplcv?utm_term=color+os+11+wallpaper PDF link annotation
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/xewalisowo.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/rijaw.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/76747607100.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///xitimisagupuxikedukume.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/dabadodejetal.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/joxepuli.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/23529812762.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613a180a1df6a---migoj.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210909124502.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210918051138956121z54db.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/koxesu.pdfIn PDF document text
    • http://yuha.be/_files/file/11343254282.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/budizinutapijomimex.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/09-08-21-54-47-94.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/zaliruwidas.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/rosovuw.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/gipiwuxamodopotutumito.pdfIn PDF document text
    • http://195exim.com/datas/files/95643486425.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/44487268854.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/76492557292.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/55894368523.pdfIn PDF document text
    • http://rapet.hu/files/fagerepenof.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/bawewimodu.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB492 15732 bytes
SHA-256: bcbdd635c66b51947f6859e9cd077df57c7f9238e992e804bb5caddd6c605732
font_01_sfnt_off0000dc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF452 10120 bytes
SHA-256: d302193261fbb99cd730863a77af3c4fbf8e311c715408e04ffc92cf39ad6d48

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