Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0af8c29cb8833ea…

MALICIOUS

PDF

238.8 KB Created: 2021-04-02 08:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 66e420ecf84ff890a4d0906e471365f9 SHA-1: c12d5323eb6e7194bf3637ed89890525775b729d SHA-256: e0af8c29cb8833ea62203639dd8ee352e6f28d56356e05dcfdeab3e91703ff68
136 Risk Score

Malware Insights

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

The file is a PDF that uses an image lure to redirect users to a URL that appears to offer a free download, a common phishing tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lead the user to a malicious resource, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://jottigo.ru/award?keyword=advanced+trauma+life+support+manual+pdf+download PDF link annotation
    • https://ligonulijer.weebly.com/uploads/1/3/5/3/135318365/9b6a34bd1c8a.pdfIn PDF document text
    • https://cdn.sqhk.co/sotisibu/e4Zzhhk/51469434927.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383699/normal_60649a96d068a.pdfIn PDF document text
    • http://favovuzoxegavix.22web.org/aorus_elite_b450_manual.pdfIn PDF document text
    • http://mematukifimuf.iblogger.org/booklet_printing_mac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415302/normal_601b9a86a450e.pdfIn PDF document text
    • https://cdn.sqhk.co/bubiwalifeda/giiiGpd/best_big_man_jumpshot_creator_2k21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466411/normal_60125155ba205.pdfIn PDF document text
    • http://lodulumadumaka.22web.org/electrocardiograma_normal_valores.pdfIn PDF document text
    • https://cdn.sqhk.co/votawusebak/dFjigdN/cube_surfer_online_gratis.pdfIn PDF document text
    • https://woxigixekamut.weebly.com/uploads/1/3/0/7/130739530/4277053.pdfIn PDF document text
    • https://cdn.sqhk.co/kidurukazag/ha1iiia/wartune_sylph_guide_for_archer.pdfIn PDF document text
    • https://fafafavavilaba.weebly.com/uploads/1/3/4/8/134893162/9c000d0e3b92c4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_52ce6bde5b2c405b99c836276f6fa44e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb095809-b54b-4b3c-9b97-77a95315ff69/sunsetter_flagpole_installation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfd77cff-a548-4582-8cc5-164c5d9d99fb/platos_republic_summary_book_7.pdfIn PDF document text
    • https://1794ee33-230d-455b-98b1-84d48067edce.filesusr.com/ugd/551769_f4323f11d630418cafb1fc570c6f0c18.pdf?index=trueIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_ed706062c7764f479bfcc594b0b63cf7.pdf?index=trueIn PDF document text
    • https://528f6e5c-6927-42ef-b7a5-a8f9c349750c.filesusr.com/ugd/07b979_7612f18bbe8e4681832a2d47c5fc8fb8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/84ec6fbb-cb9e-482b-8c8c-cbc56162bf5f/80351456912.pdfIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_f813721cba534d11bd41c7c1d575274a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8465f41f-815b-4f80-8d02-24911e0b2224/33651059519.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://scripts.sil.org/OFLIn 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_off000350fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x350FB 5440 bytes
SHA-256: 5b43aaf6c14229d5afcbb8e4022ffe9d2a09721cfde2b14f1a9243a8f1ad1627
font_01_sfnt_off0003637f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3637F 16520 bytes
SHA-256: f69ac94607e9f970b1faf5bdcac3a803f8fb842b2743f2226af1e282b288a20a
font_02_sfnt_off000394a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x394A1 16232 bytes
SHA-256: 518caaef23ff38dffd173390deb2ebbf4fc7588f1930709da0bf1b0df588cfea