Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e46b21da87a015…

MALICIOUS

PDF

76.5 KB Created: 2021-09-25 15:36:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 492f2d4c7822c7372fd3326f214469f4 SHA-1: a319573d3690d9220c31a57166d3a4f24e02080a SHA-256: d3e46b21da87a01501cfd2f5515705de96c8123d0965a5e936d9c787f7ff537a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a machine learning classifier and ClamAV, indicating malicious content. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the large number of extracted URLs suggest an attempt to direct users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://heorungminhphat.com/luutru/files/47057279986.pdf In PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/61878599211.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/vawiwebivazizononaku.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/mivajulopazasarasomi.pdfIn PDF document text
    • http://derivat.sk/files/xoson.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/75189496743.pdfIn PDF document text
    • https://eclearusa.com/images/file/winemowuwegi.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/fipopa.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/55711714658.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/niwenutogujexoruxit.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/32967656051.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/talegijenalobamejotabuso.pdfIn PDF document text
    • https://cedd.saglik-network.org/uploads/file/pizuw.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/mibomovokunu.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/70952388143.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614161fbc8440---73520288684.pdfIn PDF document text
    • http://webs123.com/userfiles/file/vanudixegisa.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/34049736205.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/dovikag.pdfIn PDF document text
    • http://1666-3668.com/attach/userfiles/file/96987830304.pdfIn PDF document text
    • http://thehedgerowchronicles.com/ckfinder/userfiles/files/zivopelepoganonipabali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=sakshi+arora+13th+edition+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_off0000bc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD468 20740 bytes
SHA-256: 2e869e0da1e7680d0675af786a63370f53201e3fd1cc8f8f7857087d44860dcf
font_02_sfnt_off00010b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0E 10940 bytes
SHA-256: bbd789dbbcfaa80189b262242342ed9b08de5b9ee7377e2ea7526fdac9ab507e

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