Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaa79614672d3f71…

MALICIOUS

PDF

73.0 KB Created: 2021-09-20 10:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f20a7194d6bd20ec83c83036b7bf756 SHA-1: 642414b3ecb4a0be4f8ecacf59ab9bb24c1ca0d5 SHA-256: aaa79614672d3f71576cceb420b0906b5623faea727fad028ff5e2db9f407baf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to PDF files on disposable hosting, strongly suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://nomylo.ru/uplcv?utm_term=remote+1+apk PDF link annotation
    • http://fotografiafrancescosomma.com/userfiles/files/18796609411.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-4/20210904221619414520.pdfIn PDF document text
    • http://yuli-china.ru/d/files/gezejozobaditerexopa.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///60754922698.pdfIn PDF document text
    • http://eva.am/files/a489deba9f9d9e54.pdfIn PDF document text
    • https://afma.pt/site/upload/file/lolisupoza.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/84549939528.pdfIn PDF document text
    • https://mcq-exambd.bdbabymart.com/app/webroot/ckfinder/userfiles/files/87256765161.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/labagilevumuwuvog.pdfIn PDF document text
    • http://grupophi.es/uploads/files/16393191085.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/55592280a3eb925ecd02b6c053183ea5/81404459393.pdfIn PDF document text
    • http://labsshop.com/d/files/88453604524.pdfIn PDF document text
    • https://ooobelkom.ru/ckfinder/userfiles/files/37462246375.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/kikajal.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/72569789796.pdfIn PDF document text
    • http://khonggianmang.com/upload/files/12183050693.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/3537639623.pdfIn PDF document text
    • http://nguyenxuanhuong.com/upload/files/tebokasizukipiwodo.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/memiwokifutatixo.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/65971189321.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/givit.pdfIn PDF document text
    • http://munsusa.org/userfiles/file/20210902145021.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210902_180527.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_off0000b816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB816 18700 bytes
SHA-256: fc63a50b94a8b69b8b41c0ad40de1ad6387f18ea31e8faa3254f588cf0b65f4f
font_01_sfnt_off0000e862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE862 10092 bytes
SHA-256: 5c68dd2ab1179cb4e30a6b681dec74706824fbd17991f8c0904108322d9f1a24
font_02_sfnt_off0000fefe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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