Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c559c693ca73a45…

MALICIOUS

PDF

81.8 KB Created: 2021-09-13 22:20:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: aed05fb63d19c583d8950d189120abce SHA-1: bb459f1fe80d2dcaaeb6050e6acb6ba6b3f0f12c SHA-256: 0c559c693ca73a45bd50647445332bfaec82b39744f5cd9bce576aff5d2eedce
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains and are likely part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://robvancampen.nl/userfiles/file/munoxe.pdf In PDF document text
    • http://carscaso.com/js/upload/files/69955363392.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/jejaja.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/zodoxoxixi.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/21771194440.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/gewifepowexugunavapikar.pdfIn PDF document text
    • https://g-stampo.com/pics/pages/file/gejaxisu.pdfIn PDF document text
    • http://schokobrunnen.com/idata/5768832653.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/tofekarenufowariwawu.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/27744295251.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/makirokubuwep.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/25759069652.pdfIn PDF document text
    • http://galantemontagnana.it/ckfinder/userfiles/files/fufurojis.pdfIn PDF document text
    • https://andhimazhai.com/images/files/romokuno.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/vurus.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/5889878509.pdfIn PDF document text
    • http://www.pacautomarketing.com/file/616962225.pdfIn PDF document text
    • https://rintrans.com/files/nariporem.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/20883241404.pdfIn PDF document text
    • http://leicesterbiketec.com/userfiles/file/setixanido.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/rusuvuxewesil.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090320454732.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210907_203228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=all+partial+fraction+formulasPDF 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_off0000d9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F5 10592 bytes
SHA-256: 76973b7c332d8d7d09feabfd5e99b26a9653445ec9b4ad7e3ce1e28021190fba
font_01_sfnt_off0000f22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3E 18000 bytes
SHA-256: e06ec30ad514113ab1ac169871ff8013454b6a4ee8f1260e76e3d61a35423268

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