Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba9aa0f85d73274…

MALICIOUS

PDF

77.3 KB Created: 2021-09-10 09:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 104db560bf9e58c234de4ae3c1257c50 SHA-1: 2fb563fb2ae4db57e2fea0a059303dea2ed7dbc0 SHA-256: 5ba9aa0f85d73274eb0a94ad4447893e001a75fb5a682fdb611ae23904c7f35d
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, many of which point to suspicious domains and appear to be part of a link farm, indicating an attempt to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for distributing malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://clubselectionvoyages.net/images/file/45395833076.pdf In PDF document text
    • http://bassbasement.org/userfiles/file/48629373933.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/59860320240.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210904015029.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/bemavetorosamipew.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/fusideketawoperox.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/pomuv.pdfIn PDF document text
    • https://remont-bez-zabot.ru/files/file/zuzokego.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/91296753453.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/xixulibiranemawogol.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135b5aa819a8---lilov.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/64782743641.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/gadaxiserekifetifo.pdfIn PDF document text
    • http://mbjarrahi.com/UploadedFiles/New/file/fasavorixiparuwi.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/92569133690.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/80758065139.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/tekemabama.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=past+tense+exercises+for+class+6PDF 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_off0000c846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC846 10600 bytes
SHA-256: 316aad9bd9c424c02e33ca5d9ec7b16d9100a50840483682b162aa255fbff732
font_01_sfnt_off0000e0af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0AF 18308 bytes
SHA-256: 988205046f35e27e9367203392cad77f0fd729cdb9bdf8103a1150cb63ffd002
font_02_sfnt_off00011022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11022 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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