Malicious PDF — malware analysis report

Static analysis result for SHA-256 927834819b919dc8…

MALICIOUS

PDF

81.4 KB Created: 2021-09-10 08:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5dc32fe6c3e204d3fa0fec14d95aeb5f SHA-1: e3eda788f95abbe8c3510298296e163744b47d5e SHA-256: 927834819b919dc835fcbe346188c6460564eb13077c3f7b01fa5c37ff92fcd9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=evilz+virtual+app PDF link annotation
    • https://chungcungoaigiao.vnpec.xyz/uploads/files/28550089331.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/masanax.pdfIn PDF document text
    • https://nepaltrekkinginhimalaya.com/assets/userfiles/files/17722309000.pdfIn PDF document text
    • http://balaton.varosom.hu/userfiles/files/76517153123.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/20486132931.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161304a832dcdc---berigavudokekaj.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/32847381909.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/77352407452.pdfIn PDF document text
    • http://yenidenyuzlendirme.com/ckfinder/userfiles/files/nejaza.pdfIn PDF document text
    • https://0286869143.com/editor_images/files/sumana.pdfIn PDF document text
    • http://conservativista.com/js/ckfinder/userfiles/files/9034682771.pdfIn PDF document text
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/jinekipitilimuziteka.pdfIn PDF document text
    • http://airmon.hu/images/files/26164928832.pdfIn PDF document text
    • https://digicpictures.com/downloads/tofudewulafarivi.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/dawumep.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/rafubenobula.pdfIn PDF document text
    • http://vkts.se/userfiles/file/miwuwu.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090310044073499.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/zularoxurigewirevebuta.pdfIn PDF document text
    • http://proclima-membranes.ru/userfiles/file/turelubipezidoroso.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/kijubon.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/94805266252.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/gusadamutozaxufixagoxufej.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/lamepogapikenomigopop.pdfIn PDF document text
    • http://xn--80aejmo0alc.xn--p1ai/ckfinder/userfiles/files/damugogaxisabobexibolu.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_off0000db2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2D 17832 bytes
SHA-256: 040d8fa50455d97813e6f7f445d49d6687ba0c99e8fdff0d89aad0b875a18d09
font_01_sfnt_off0001097f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12195 9932 bytes
SHA-256: c9960f853fcb8a6930324120b624077aa0d9fc61a634edd47e56f780e76e03b5