Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6cce869674ccc1…

MALICIOUS

PDF

80.1 KB Created: 2021-09-18 16:14:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f6813ece60f27356159136bded2a16f7 SHA-1: 74a4b4919bd9b69395472b133573d7856be7a0db SHA-256: de6cce869674ccc16d35095855463b76bd5c0e13d96b152f4dd0ec67168d6500
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also contains numerous external URIs, many of which point to disposable domains and are likely used for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gemma.lucien-sv.info/uploads/files/61370d32569b3.pdf In PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/43476873513.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/12477607270.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/refaruwixagabikixe.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/wiwunuzera.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/lisefegijukelefeme.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021090208143273499.pdfIn PDF document text
    • https://ud-hobby.com/images/Upload/file/kawatatiweboba.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16144a0ef751e7---16919825536.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/50018220863.pdfIn PDF document text
    • http://uchid.com/uploads/file/21271525964.pdfIn PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/90847201207.pdfIn PDF document text
    • http://yongqingtech.com/d/files/xikusuli.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/41497687309.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/pivasurugemujibud.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/wewamupakavisobupevejalu.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143d6d7e2923---86650222604.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/8858471468.pdfIn PDF document text
    • http://www.tecnobor.es/ckfinder/userfiles/files/newiweperubozilirev.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/2998277942.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/76013179974.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/70008773563.pdfIn PDF document text
    • https://elnativocoffee.com/silver/upload/files/mubatexurer.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/89297007484.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/7907527511.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=frozen+wallpaper+hd+for+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_off0000d6ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 17052 bytes
SHA-256: 20035416ca64e46dbfe14636bb667c67b42ba0306e8120844a7bbefb62f69f5b
font_02_sfnt_off00011b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B36 10452 bytes
SHA-256: 67ce6298036f7deb448fbd221064655acda05b42a133ae979503696f11818eb4