Malicious PDF — malware analysis report

Static analysis result for SHA-256 f18a9cc5d25b5f65…

MALICIOUS

PDF

82.1 KB Created: 2021-09-09 06:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e11867a749bfb797094e28c13174f78 SHA-1: 00b387e41968b8646e4b46dcf05e7eaddb626808 SHA-256: f18a9cc5d25b5f65d7d58b4b558393c49db02e3ce789823f22ce04899fa320ee
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript (T1059.007) suggests an attempt to execute malicious code within the PDF viewer.

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 https://coretry.ru/uplcv?utm_term=clear+app+data+on+android PDF link annotation
    • https://digireg.ch/upload/5816448207.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/sefixamexamatefewabunisug.pdfIn PDF document text
    • http://www.saito-ken.jp/userdata/file/luman.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/29974437120.pdfIn PDF document text
    • https://isosklo.cz/uploads/mapudobos.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/keratov.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/34768747727.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/58238250401.pdfIn PDF document text
    • http://gyndoktors.de/ckfinder/userfiles/files/degogufezetapepov.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/masedi.pdfIn PDF document text
    • http://licausi.it/userfiles/files/sexusigaserodiledunesep.pdfIn PDF document text
    • https://adikketiga.com/contents/files/xapodajopokisoxu.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/84063055247.pdfIn PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/45661151579.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139461ebaeba---domesugejifamedub.pdfIn PDF document text
    • http://napiarsaigh.com/images/tijid.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/bigeko.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/63376906784.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/girakuwo.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/3886489401.pdfIn PDF document text
    • http://quetthe.com/upload/files/kapuvamuvofufokufevuta.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/bimirutafidimidawejeb.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/50845397528.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_off0000df89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF89 17084 bytes
SHA-256: 84512fb41219ec251e9ace737e1c5953aeebff7567b13f4cf40e8d8c64e42f57
font_01_sfnt_off00010bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB1 10248 bytes
SHA-256: 2be6a936c9eec2fd463694fe09686f8d62ee38356a0dfa66902ca61a1adeccab
font_02_sfnt_off000122c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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