Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7ecdb913febc439…

MALICIOUS

PDF

70.1 KB Created: 2021-09-18 21:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 82194ea0fe73ad94f9b3ee71006813f4 SHA-1: 47372d1f8801447894c32bce183d7ead50beb115 SHA-256: c7ecdb913febc439f7ec66bc2751b1e90bac6e699adae231abecea8b12d2f7de
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests these are part of a link farm designed to redirect users. The presence of external URIs and the nature of the heuristics strongly suggest this PDF is used as a lure to direct users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://infrive.ru/uplcv?utm_term=emerald+version+rom PDF link annotation
    • http://chongthamphucthang.com/images/news/files/lirafapu.pdfIn PDF document text
    • http://salman-group.com/userfiles/file/41447917639.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/51155472853.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/15479466270.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/52829923510.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/28209678772.pdfIn PDF document text
    • http://westfallassociates.com/documents/file/jebuvunuxo.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/wuroxepibijipulagika.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/mekipabuxuxobepo.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/422995806.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/zapepirogatikinakiza.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/muzedopibenaxe.pdfIn PDF document text
    • http://yushendesign.com/images_fck/file/1630586124.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/44367159726.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/4cc9472b0db5a1f1aed76ee0bb75a9df/26109506735.pdfIn PDF document text
    • http://lachina.cn/upload/file/15345544392.pdfIn PDF document text
    • http://concilianavarra.com/userfiles/files/gadakazematixixokarezebaj.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/20055054101.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210912124629.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/47654956353.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/80732021062.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/248f80a2a93d6c6ff596f0729c40ec4f/gupubomu.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_off0000b1f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F8 10360 bytes
SHA-256: 51dc571447d46059308a5702954e26b7ad8fbd6d7c26c80f3826e36ff829f96a
font_01_sfnt_off0000c944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE156 15784 bytes
SHA-256: 4cfe19c300a418e3308ac609ec6f5ebe6cde52898847328ce1739ddb580f29ff

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