Malicious PDF — malware analysis report

Static analysis result for SHA-256 8badc08afffd071b…

MALICIOUS

PDF

67.8 KB Created: 2021-10-02 13:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 18cef695381e2a7938924c4d9adf3b1c SHA-1: bab55a72e434f5642a48c368a5ee1ce8b69d7ac6 SHA-256: 8badc08afffd071be741df373f5d2387e7f01cd703359778cbc144dd0f4ceff1
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an embedded URL that likely leads to a malicious site, and the document structure suggests it's designed to trick users into clicking through. The presence of multiple external URIs and the 'image-only document with action trigger' heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 https://inwebjor.ru/uplcv?utm_term=subjunctive+1+and+2+english PDF link annotation
    • http://to-tuong.com/media/ckfinder/files/fakijilujigodonajusavez.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/xufonemonuxazususatosowa.pdfIn PDF document text
    • https://fishboat.hr/files/borise.pdfIn PDF document text
    • http://xhzhengli.com/upload/56542486715.pdfIn PDF document text
    • https://notarbrazda.cz/userfiles/file/In PDF document text
    • https://najlepsze-w-polsce.pl/uploads/540472050.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/38425113741.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161491efab2080---vunanuwudeligokan.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/tewelujavorisode.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/2505331724.pdfIn PDF document text
    • https://vnsteeldetailing.com/UserFiles/files/zuminuvojaregewela.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/hre96chvcutr14ca88s2l0dfm6/40278724814.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/86643851469.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/kosujupivowometi.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/sapixap.pdfIn PDF document text
    • http://dtmaso.com/public_html/Imagens/file/kozegixelagigumiboniluwe.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/93002205525.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/pimisedazepe.pdfIn PDF document text
    • http://intertribo.sk/files/jozodapulovijigepobele.pdfIn PDF document text
    • http://mibenjamin.com/userfiles/file/22278258381.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_off0000aaa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2B4 14408 bytes
SHA-256: e64b7df6b612ee3e354d18339c81596a359443e550047647df7a9f350ff154a3
font_02_sfnt_off0000e6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CF 11112 bytes
SHA-256: acb67ed256f750793bd1d5d01f51059e6cb1be8a2743d30da30c9cfb616d7ac3

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