Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ac39407d72032e…

MALICIOUS

PDF

87.5 KB Created: 2021-09-12 02:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fcc3e3de9ef9189adcea5ffe06ef3aae SHA-1: 63747d4a953b11e12e5038317d494b91f86283b6 SHA-256: e5ac39407d72032e01e1f4ae45c8c5b545edb48e7ef1302cca732a3639498a5f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, suggesting it may execute malicious code or redirect users to phishing sites. The PDF also exhibits characteristics of a link farm, with numerous links to external domains, many of which are unknown or potentially disposable, further supporting a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d317f744a1---35956153662.pdf In PDF document text
    • https://lalicorne-hotel.com/userfiles/file/womefepazatodofas.pdfIn PDF document text
    • http://silver1979.com/upload/file/7530722925.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/vowegirujebabojik.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/fakivunujejiwame.pdfIn PDF document text
    • http://bscartridge.com/pic/fuxubemujunijodabufibofof.pdfIn PDF document text
    • http://nessie-vinylcare.com/file/55490470656.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/sugimoxasekik.pdfIn PDF document text
    • http://targhevaticane.it/userfiles/files/28886975516.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/nujadaribudezuker.pdfIn PDF document text
    • http://talleresjpg.es/img/file/72999191821.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/16797540747.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/jinulemow.pdfIn PDF document text
    • https://augsburger-dartliga.de/uploads/file/52098687569.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/pawuzurigaxezamapixej.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/witinijolezifuw.pdfIn PDF document text
    • http://crediramasrl.it/public/file/defarefuzogivurugixiges.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/69856000634.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/wefutefurad.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf90254a5d---9349924989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=animal+jam+generator+2021PDF 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_off0000f21a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2C 17756 bytes
SHA-256: 01e4b333b3695b5f4312972468c83dfdc4f4c461638c9f1c741ed40f5a2c6cd2
font_02_sfnt_off000137f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F3 10688 bytes
SHA-256: 9e391ffda766b7de70ecfb2d017d28acecea37207a22ea8d413e6528e35a3837

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