Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59572784fef3832…

MALICIOUS

PDF

75.2 KB Created: 2021-09-13 18:33:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ff4cf370f8168cdbe21d96aba4b9d570 SHA-1: af04f9fa1b916b6d3f552df6a1dc0e8dd32b8e21 SHA-256: e59572784fef3832ce8a469c7431bf0e9bc1bd6ab678d6f265562f847315f6d8
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to other PDF files hosted on suspicious domains, suggesting a link farm designed to distribute further malicious content or phish users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://greenflameenergy.com/userfiles/file/19228088320.pdf In PDF document text
    • http://pomelieagency.com/userfiles/files/gikata.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/tadubojedomovu.pdfIn PDF document text
    • http://scales-center.com/shop/fck_file/file/79971633092.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/98222974062.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/nabup.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109022108509027.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/memumelojitoba.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/94222145104.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/mufogimuva.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16133172465d12---1947648429.pdfIn PDF document text
    • http://deforma.it/userfiles/files/dederisox.pdfIn PDF document text
    • https://jurad.eu/files/file/52452456414.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/12611501488.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/20175782863.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/48551627221.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/figezumenarigoxe.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/xasubigopobopavikotadajej.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/47229633507.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/zetilow.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210904211606.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-9-8/20210908092129123697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mutants+and+masterminds+handbook+pdfPDF 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_off0000c0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EE 11040 bytes
SHA-256: b8b82bb3579e8e4a671fc2ce21257b461b6e767554f3e7acd96e057ea53ff016
font_02_sfnt_off0000f229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF229 17408 bytes
SHA-256: d88e9d01183973fea6f6c75c2543f349ce0d0594e518dfd32f1115df1e71277b

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