Malicious PDF — malware analysis report

Static analysis result for SHA-256 d113272c7ef00505…

MALICIOUS

PDF

75.4 KB Created: 2021-09-15 18:07:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 013c24f8fecc80d0a1bbfc4f142ad68d SHA-1: 9d538d181001152429babd63bd068b53ac7d08b6 SHA-256: d113272c7ef00505ea031d3ec7a88811e8e60cf6c3c9794ef91dee000e8a6c02
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with a critical ClamAV detection for Pdf.Phishing.Trojan. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on disposable hosting, suggesting a malicious intent to redirect users. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://t-groupvnxkld.com/uploads/news_file/71010836614.pdf In PDF document text
    • https://renault-service.com/userfiles/judunawapame.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141432243e58---tupowusawuguvitomiba.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/ecaae8a03a96ee6a4a6ae783dc973334/viduk.pdfIn PDF document text
    • http://fkhd.cz/data/img/lezuradoxajere.pdfIn PDF document text
    • http://aqcorth.specialty-match.com/upload/files/44518614637.pdfIn PDF document text
    • http://perechen-izdaniy.ru/js/ckfinder/userfiles/files/64818968653.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/78217831831.pdfIn PDF document text
    • http://stefani.cz/fck/file/54181727682.pdfIn PDF document text
    • http://polletnv.be/uploads/files/dojuj.pdfIn PDF document text
    • https://euroialinsol.ro/userfiles/file/nuzadonolubuzinogataperid.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/47191611721.pdfIn PDF document text
    • http://caogenzhiben.com/filespath/files/20210902122643.pdfIn PDF document text
    • http://poornasreehomeoclinic.com/ckfinder/userfiles/files/76838687437.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/73091719493.pdfIn PDF document text
    • https://cli-kh.com/uploads/files/202109152008295708.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72820767790.pdfIn PDF document text
    • http://handgun.ee/media/file/milagunadakidabe.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/17600504412.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/bewiziloxejuke.pdfIn PDF document text
    • https://pollackmihalyiskola.hu/ckfinder/userfiles/files/64635719988.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+send+pictures+from+computer+to+androidPDF 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_off0000c3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C3 10912 bytes
SHA-256: 53cf163ce44e2681a4cf627b3314f6cd17fbbce61e893e0f6405798b83891dd0
font_01_sfnt_off0000dd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0B 16532 bytes
SHA-256: 058cdab5e2dceccc5d7c1900c232e63ff690e99741aba119b89a5044107f197a
font_02_sfnt_off000107b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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