Malicious PDF — malware analysis report

Static analysis result for SHA-256 4787bd51019922ca…

MALICIOUS

PDF

72.2 KB Created: 2021-09-26 06:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4c1f46594a842b79fd6cefc149bcb64a SHA-1: 55f318306daf786c2e23ecd43f64a3775d22ac9f SHA-256: 4787bd51019922cabb3c4bcbca32db394b7ca415b8558f29ea6ba6ebaa0681c7
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the download or redirection to a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://www.mecateengenharia.com.br/ckfinder/userfiles/files/ririvakawabenojetawiwezoz.pdf In PDF document text
    • http://placc.info/up_image/44620190546.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/tamufapajator.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/57367406290.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/pumebugenalofuj.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/gomopazuridowugaxagaj.pdfIn PDF document text
    • http://taxilitomerice.cz/ckfinder/userfiles/files/wiwonadibaxomasegadu.pdfIn PDF document text
    • http://image.dlib.vn/libedu/news/bvu/20210919/file/resosibezedikefirobineze.pdfIn PDF document text
    • https://dragonexpressml.apnaconsultant.com/userfiles/files/96591895251.pdfIn PDF document text
    • https://ijpdua.com/contents/files/39772504720.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/xajesudadurerarage.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/45596993145.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/mexulonefosokozava.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/mutawileluxavus.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/77137605657.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161476bb1d4a70---jugifuxomaligokufitos.pdfIn PDF document text
    • http://compufoxmail.com/FCKeditor/editor/filemanager/connectors/userfiles/file/94776927258.pdfIn PDF document text
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/87241552809.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/gizinupimiridafos.pdfIn PDF document text
    • https://shunnasato.com/fuwevolubopukumakuxatovo.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/menizewufifakodu.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/80835253912.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/20243179690.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/68030017381.pdfIn PDF document text
    • http://bigyikesmedia.com/home/xtremweb/public_html/consultinstitute/web/upload/files/zumeboxis.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/nipoke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=use+xbox+360+controller+on+androidPDF 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_off0000b544.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB544 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD56 17020 bytes
SHA-256: a7d23298d037741fd798e3d570fd07f86b323ed0d6c3cd68da73de6399151904
font_02_sfnt_off0000f8ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FF 11072 bytes
SHA-256: 8f37c5e225db23d9730bb7ad286d6ebb2e6352381fc7928a34b55ec36a009d36