Malicious PDF — malware analysis report

Static analysis result for SHA-256 5573d0462d2575dd…

MALICIOUS

PDF

78.1 KB Created: 2021-09-13 00:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4eda8df5612c99d33b754083e968c6a4 SHA-1: ad65a8fb02c822bb153e3e0ba05cc3e08aef4eb2 SHA-256: 5573d0462d2575ddabcf1ccaded95150d75d3ba0df2006f9d2833c8eabdd0fb8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links to potentially disposable hosting, suggesting an attempt to distribute malware or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://laser123.com/geektic/files/40665736656.pdf In PDF document text
    • http://precisao.net/files/files/5485322224.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16133dca301672---17772365726.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/jepepekozu.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/59589293796.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/piwusujusemuzi.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/naxusikuzis.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/52770268007.pdfIn PDF document text
    • http://gazetavk.ru/img/file/wufilagakoxozoze.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/20794321983.pdfIn PDF document text
    • http://baozhaopharm.com/upload/files/48400749923.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/64123589182.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/visibuzewu.pdfIn PDF document text
    • http://schokofontaenen.de/idata/83652704931.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210908142402.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/74839905931.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec9e2c6a18---sirafakipamaba.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/wetanasasekinowor.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/xelepaxutifubi.pdfIn PDF document text
    • http://cnokorea.com/userfiles/file/sokawinowulorakine.pdfIn PDF document text
    • http://htwy.com/upload/file/zirukowozefezozuf.pdfIn PDF document text
    • http://twapp.freshkon.com/upload/files/pezujaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=pokemon+sword+and+shield+download+on+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_off0000c9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C7 19064 bytes
SHA-256: 298178f8520209782dfa758f240b4a912528ab79979c1d0fa5a9e0056d87fe07
font_01_sfnt_off0000faf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001130e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130E 10596 bytes
SHA-256: 0f8df95130177fad20532f8441b0a676a5f74aa3efaf6f4759e05c73712ff71f

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