Malicious PDF — malware analysis report

Static analysis result for SHA-256 90724833f9e2a96a…

MALICIOUS

PDF

78.6 KB Created: 2021-09-24 03:50:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6a040ee760aadce468236278316441e3 SHA-1: 36240e287cb9dae795c9618e78f6eb0c78fe0557 SHA-256: 90724833f9e2a96aa183cbc906b99af6097d1a3dc5be3791656d8be0841d656b
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm, with numerous links to other PDF files hosted on various domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://aeon-dev.com/uploads/files/202109131024139230.pdf In PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/defaxisirupukaxutu.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/besozojupojutejogosok.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/tobowowugadigobiluku.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/kewufeguzagofafel.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142658da3dfc---lagaxiki.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/60945223281.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/rufasapipavalowevuje.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/1844490812.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/lofuzovawij.pdfIn PDF document text
    • https://777mto.com/contents/files/jujimezirezexuk.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/dokemu.pdfIn PDF document text
    • http://learningkey.org/userfiles/mosomelidotidujafozur.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/15979068166.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/61707254177.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/bixejanunosaboxadaf.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/b4e11b1a4f150b2728a39a8a13004550/botibiradopo.pdfIn PDF document text
    • http://reicar.dk/userfiles/file/xamomosabiwuzamor.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/kobusofefimev.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/timalefow.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/76359497075.pdfIn PDF document text
    • http://duocmyphamcongty.com/app/webroot/uploads/files/69734827057.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0850284001632443652.pdfIn PDF document text
    • http://www.likoda.com.tw/upload/ckimg/files/vozulon.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=kuami+eugene+new+song+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_off0000cca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA6 10680 bytes
SHA-256: a5f31020a334b0740eb138bff403945434af6e646e94e05ee2b56915ac8d6f15
font_01_sfnt_off0000e543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE543 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD55 18140 bytes
SHA-256: 78975a74ba5fa48b456249dd355d483523800ab09b5e6bffef86f25817d40898