Malicious PDF — malware analysis report

Static analysis result for SHA-256 1368c2f30db59073…

MALICIOUS

PDF

70.5 KB Created: 2021-09-20 11:27:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3e66c0ec5ecdc66040bafd2aa6380a61 SHA-1: f6dd8309d8e67c7e9f6aa9691f85b60469e386fa SHA-256: 1368c2f30db59073b5100c44a8ad4061ecd4e15a71147c69a547cb20fa6cfaa0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The presence of numerous external URLs, many of which appear to be part of link farms on disposable hosting, suggests a phishing or malware distribution scheme. ClamAV detection and ML classification further support the malicious nature of this file, indicating it likely attempts to trick the user into downloading a secondary payload or visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://oniceh.ru/uplcv?utm_term=2+player+games+unblocked PDF link annotation
    • http://bayanairag.com/uploads/userfiles/files/desivomewade.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/223151edc68a8df1b72e677ed1f55057/tikugonajomidutex.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/bigojelonod.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/82849680182.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/lepov.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/72781119212.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/30282680185.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/25534420131.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/40575903511.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/mujilimu.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/28393647261.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/16652719717.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/gakorufebalotezep.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/numisoni.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/meniridunonebo.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/15722466594.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/renepobe.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441a3c04e14---33554972043.pdfIn PDF document text
    • http://arcstema.com/userfiles/files/folasafunutiwa.pdfIn PDF document text
    • https://bvphcn.bdata.vn/upload/files/mifewigepiruduxesa.pdfIn PDF document text
    • http://zl369.net/userfiles/file/majodivenit.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/tabosudexudilunowepaj.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/12494192202.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/22893410917.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/32096045894.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/31662414665.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_off0000b4c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C9 15008 bytes
SHA-256: 968674970a618bb4788ab672993c16f0d003cb37e076323f3f473bd7c135933b
font_01_sfnt_off0000dac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC4 11136 bytes
SHA-256: 848d329ae4f4e2e0385a054caeb381c65963107f2118597cfe1d61164fd60f85
font_02_sfnt_off0000f471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1