Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0e4b2219a1a5479…

MALICIOUS

PDF

71.1 KB Created: 2021-09-26 19:36:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0093989d6f92719bf3f525798ffa80eb SHA-1: 13ed69bf773f2ea6cf7956930e4edd2055cfb2d2 SHA-256: e0e4b2219a1a5479df146707cfea943d03c828513e8107f5c9775998adad125e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for delivering malicious content or redirecting users to malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent. The numerous external URIs, many hosted on disposable domains, suggest a link farm or phishing operation designed to distribute further payloads or lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=android+call+protect PDF link annotation
    • http://quranday.org/userfiles/file/gatudefidusuwobabolaxa.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210918042437.pdfIn PDF document text
    • http://enricobarraco.com/files/jokujexojoloranajopu.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/27484366125.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/29082154920.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/lewukadawufipumizi.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/13998080759.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/pujilu.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/32100532544.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/16742093042.pdfIn PDF document text
    • http://obras.ru/sites/default/files/uploads/vidudotopodudezojan.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/79868616312.pdfIn PDF document text
    • http://mebel-moscow.com/content/xuploadimages/file/fomozufifejuvixege.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/garozepijajekodasagur.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/xosor.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/vigodajidukimagujitezamem.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/woletigiraliwugugajog.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/zusizizadiseri.pdfIn PDF document text
    • http://dialogueinpraxis.net/files/docs/30642567026.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/28550353619.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_off0000b047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB047 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c85e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC85E 10320 bytes
SHA-256: 15bd076b0c5bca49b7c229ab08cbd57676ec2698181d70e43faf652f04ee2606
font_02_sfnt_off0000dfb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB7 18520 bytes
SHA-256: c33985da971a1ca9d848f3f41a8b7cc36c4bdbea9f792ba201e7e8ebe78cfb8e

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