Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7156cdbd4702ff0…

MALICIOUS

PDF

81.1 KB Created: 2021-09-21 22:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: e56296b5bc92431ca2d459ac8dea5945 SHA-1: 9cddb79a1681e2fb856efbbdbc19bab2f11c6a33 SHA-256: b7156cdbd4702ff0c9a7e7ec78adb4790994d36c923c3ed7e8face1c1d65c2a4
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URIs, including one pointing to a raw IP address and another to a disposable domain, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a secondary payload or phish credentials. No scripts were extracted, but the PDF structure and URI heuristics point towards a malicious document delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://sergeca.com.ve/ckfinder/userfiles/files/lubiwesisabeku.pdf In PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/27800736656.pdfIn PDF document text
    • https://alcoquimicos.com/ckfinder/userfiles/files/41537669133.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109212046241851.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/kejimemavipegufefezik.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/14572686986.pdfIn PDF document text
    • http://livestocktool.com/d/files/18261559008.pdfIn PDF document text
    • http://sieuthihatgiong.vn/webroot/img/files/73872672413.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/moxil.pdfIn PDF document text
    • https://bipalisdemo.dashindonesia.com/userfiles/files/lebenovozibeninodup.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/busovesepode.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/wulaxosuzomivafefezadopof.pdfIn PDF document text
    • http://plnjl.com/userfiles/files/lifamek.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/6130617499.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/dogawijoxorelol.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/26618560296.pdfIn PDF document text
    • http://surausa.com/uploads/files/10450227317.pdfIn PDF document text
    • http://asustainable.com/global/file/66200050649.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/lejafonirumulupa.pdfIn PDF document text
    • http://1-sanya.com/blog_images/blog_/file/zomulotebudolok.pdfIn PDF document text
    • http://140.121.180.103/ckfinder/userfiles/files/65162859887.pdfPDF link annotation
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/18781617318.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=mr+india+full+movie+hd+1080p+downloadPDF 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_off0000d818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD818 11124 bytes
SHA-256: 56fc8d74e2e1e6353d12b6d15e7f4af87f241ab5b0299cd2a8447798865b8933
font_01_sfnt_off0000f1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000109f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F4 17388 bytes
SHA-256: 24401b946bfccae5b625ee1d9b33bcf8678f18aac7e06084b90f40ffe0a02405

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