Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9712473bc4c80f2…

MALICIOUS

PDF

70.7 KB Created: 2021-10-02 19:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 67d9f4addf3c678ab748d41db2481f00 SHA-1: 86d9f5211dab9b551b47455bb9a04c3414a61ed6 SHA-256: b9712473bc4c80f25de3653b84e702ec64ac8769030313482eee2c125c975f62
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and it contains embedded JavaScript. The PDF also acts as a link farm, directing users to multiple disposable domains, which is a common tactic for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code upon opening the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://krisoc.ru/uplcv?utm_term=leaves+of+five PDF link annotation
    • https://euchebnici.com/img/file/1329710463.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/38089281341.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/savavuv.pdfIn PDF document text
    • https://vsevolozhsk.mebel18.com/uploads/files/96709595527.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/sirakupikigiwogulijigol.pdfIn PDF document text
    • https://eltechma.com/zdjecia/fck/file/80336164255.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161420f4379972---18258892021.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/ponamuritarukuxipasuxaja.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/70621018359.pdfIn PDF document text
    • http://mediasingrid.com/js/new/fckeditor/userfiles/file/89991486776.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/wijefomasudaluwonu.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/66jt405kl2h8oa9anhh7i4hp55/26233651252.pdfIn PDF document text
    • http://trunghungplastic.com/luutru/files/pajapuguzazunumemisux.pdfIn PDF document text
    • https://www.sophrologue-nimes.fr/upload/news/files/88054756807.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/pokis.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/mivirozabijiwujad.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/42602113652.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/bifaz.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/72386089408.pdfIn PDF document text
    • https://whitesal.com/data/images/file/2571_20210928000129.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/xozuxenulumop.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/kitejuxojuzitegu.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/16335361561.pdfIn PDF document text
    • https://www.sesc-am.com.br/Selecao/ckfinder/files/bonepozoxilelo.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/pofogas.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/9565135948.pdfIn PDF document text
    • https://gallerylingard.com/uploads/file/56487818323.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/11403542286.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_off0000b4cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CC 16808 bytes
SHA-256: 52f3adb07a5f67fff043dde8e7bd73f724ae5154f22df204b931df6c14e7faf6
font_01_sfnt_off0000dfb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C8 9884 bytes
SHA-256: 059c4166825ad7b86afe608029645755e66bc6e97d217e2bfdba1c9a2f484b7f