Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef28c6ed49cb7c3d…

MALICIOUS

PDF

85.8 KB Created: 2021-09-18 20:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d8dce0c5e11d7ab3a4af4387729896f4 SHA-1: 9f5f2f8763f09e696719e097453d5b3871824922 SHA-256: ef28c6ed49cb7c3d75a4901018972a98e245ccc00f74d8880d4f3e7db86635f0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving redirection to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://irlanc.ru/uplcv?utm_term=miraculous+crush+apk PDF link annotation
    • https://shevian.com/images/file/24809642164.pdfIn PDF document text
    • https://attack.lt/images/files/94958054641.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109130352172380.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/zuvuminimunu.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/jiwugagufitagog.pdfIn PDF document text
    • http://topenglish.sk/app/webroot/gallery/files/89976346665.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133623371e3b---8900306156.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/bikopur.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef6bfe2a0a---89172497905.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210914005918.pdfIn PDF document text
    • https://bandotrading.it/uploads/file/85655404087.pdfIn PDF document text
    • https://artenika.pl/fck/file/budexutoxevasal.pdfIn PDF document text
    • http://cadelupo.it/userfiles/files/saliporefoju.pdfIn PDF document text
    • http://climtech.com/files/files/1978688681.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/janutanejefi.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/32422978244.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/59588558788.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-7/20210907012724165497.pdfIn PDF document text
    • http://sinostandards.net/upload/files/wenafajakewetuxego.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/86009928559.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/vimegebapewifo.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/gokosaramejo.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/16403391474.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/43546132684.pdfIn PDF document text
    • http://forum-auto.ru/data/files/xitaluputosal.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_off0000e89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B5 10324 bytes
SHA-256: bec072f6392493011b644f70182b802f35a9712eb812ceea0c47bba972fb942a
font_02_sfnt_off0001181f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1181F 18924 bytes
SHA-256: c080e0636bbea386ad138c85e9a8a3e9192a05b6498b03fb3d082417d4d4a21a

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