Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a71c16694d7ccf…

MALICIOUS

PDF

82.8 KB Created: 2021-09-13 23:23:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 96be590c9b42ec0da725cec05eb002a3 SHA-1: 702040045f92f1de9d95af71ddc0bc0493f38e91 SHA-256: 13a71c16694d7ccf1f9954b74b7dc8265525d406688fc8b1018b61c14c0f1f49
134 Risk Score

Malware Insights

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

The PDF contains numerous links to external PDF files hosted on various domains, suggesting a link farm designed to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://landroverbh.com/ckfinder/userfiles/files/gunuluvivabezafewozor.pdf In PDF document text
    • http://dunajecbiala.pl/upload/File/62298230125.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/36399128863.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/gifuvopedazar.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/rovuwixularex.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/8107006550.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/vogobasewureviposus.pdfIn PDF document text
    • http://likuidart.com/files/ckeditor/files/godasogunebide.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/dovetijus.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/mifeliz.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/rotiguza.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/vinasunozijuzakuk.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/bikasewuzit.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/57661487509.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/vegakutore.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/42097469040.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/55930348169.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/9488845884.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/90731719695.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/niwoko.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/kekazuwopofoxekoxadobu.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/wimukakimujelok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=minecraft+pe+wither+storm+modPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1E 18360 bytes
SHA-256: e462ef217aa96ee217187babf2f475bf1a7d229913f31f6f5f9baf91dde4179e
font_01_sfnt_off00010c28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001243f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243F 10920 bytes
SHA-256: 225b538ac2a03ccc376a849e900190998097416ead4e2f178493b1c46d7f54a2

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