Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b4368770b8986c…

MALICIOUS

PDF

80.6 KB Created: 2021-09-12 18:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a4f40a08bd2a6499a8e1fd043c28e36e SHA-1: f223035876fe6160afc0f87442602b7b53d36dfa SHA-256: 04b4368770b8986c735ce22b4290d1f63926b142cc76a53fd353d5cac8e3e9a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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
  • 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://medvor.ru/uplcv?utm_term=naruto+senki+mod+download+free PDF link annotation
    • http://rigdrilling.org/userfiles/file/33145476184.pdfIn PDF document text
    • https://signatureshreyas.in/userfiles/file/xedidanavinijufimugifowam.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/25962282438.pdfIn PDF document text
    • http://somkuthyoptika.hu/editor_up/lipazaduvomagid.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/39486393739.pdfIn PDF document text
    • http://skupka23.ru/upload/m/fejatiloremav.pdfIn PDF document text
    • http://yidaig.com/uploadfile/file/20210903050103.pdfIn PDF document text
    • http://kammed.com/userfiles/file/50516745151.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/numisoni.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/vokukifufu.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/popuzovekemajawodatekow.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/666992615.pdfIn PDF document text
    • http://vititanon.com/user_img/files/bofudugowu.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/41514448030.pdfIn PDF document text
    • http://oroblupiscine.it/userfiles/files/gujugotapiben.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///misejazebaxumixekatali.pdfIn PDF document text
    • http://webmba.fr/client/logo/file/86876755654.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161375c8fdac30---jepofitifukawosogubon.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/71647007831.pdfIn PDF document text
    • https://maciejabramowicz.pl/upload/files/file/wajumibomazivij.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/giwazidufopasixonosip.pdfIn PDF document text
    • http://tramtronbetong.com/uploads/userfiles/file/tefumedoru.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/fiwunadumivel.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/11634765483.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_off0000d6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBF 10772 bytes
SHA-256: a0adde66dc73092b1b851ffe16a0e5a50271a2e736fde1e6fe01ec201df7c778
font_02_sfnt_off0001079c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079C 17616 bytes
SHA-256: 3bfa3b98ad2cab37a6692e8bc69629b92f048b958455fb742c20251134de2198

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