Malicious PDF — malware analysis report

Static analysis result for SHA-256 b026d533e4c6f683…

MALICIOUS

PDF

70.0 KB Created: 2021-09-25 10:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b1aa1acfa607fd8305e8882e3941c99b SHA-1: b731531d9feccb97f2d3956dd5901920cb289365 SHA-256: b026d533e4c6f6837f491a709584d8b45e191495a2d0084c4f64e3dbe5b3881c
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to distribute malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high volume of links across many distinct hosts, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://rafaelokazakov.com/file/72116248582.pdf In PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426dd4cba50---24946556394.pdfIn PDF document text
    • https://svilia.restavracia02.com/userfiles/file/65128705288.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/gorale.pdfIn PDF document text
    • http://manu-transport.com/documents/file/17500204445.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/907936179.pdfIn PDF document text
    • http://slxiang.com/v15/Upload/file/20219211750244872.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/jiruzejojavumefovexomew.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/rixisetelufanofuwitirorur.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/pixudifer.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/lesezetabux.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/9172760458.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/jefele.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/19247914813.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/32954451012.pdfIn PDF document text
    • http://magicfood-cn.com/files/20210901140041.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/torilamufolufokev.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/zikogumun.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-22/20210922165033367229.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/83862139730.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/kifakepixorepobilu.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/genojemobitemutejafup.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/vefamisudep.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147256baa61c---demufejanaf.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/86348604748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=traffic+racer+apk+hack+downloadPDF link annotation
    • 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_off0000b1d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D3 10592 bytes
SHA-256: 58a879d4677ffb64d413e600c94124ff1505c517a971a233bbb0380cb763952d
font_01_sfnt_off0000c9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE207 15984 bytes
SHA-256: b888ef7653ff4e36d256e8f77079293e7131f206632528eb8a5e7290f3302d39