Malicious PDF — malware analysis report

Static analysis result for SHA-256 b31d7b952f7fd6dd…

MALICIOUS

PDF

70.4 KB Created: 2021-09-28 08:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 60b5e5359e8dbc23b679fef6bd326003 SHA-1: 011d95c6a7c4bbdde7cd0edbe313cb249f1d4772 SHA-256: b31d7b952f7fd6dd0ead117f875b29eb1e226ec71a7111ebeb80b118f21465e8
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external URIs, many of which are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

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://medvor.ru/uplcv?utm_term=hill+climb+racing+mod+for+pc PDF link annotation
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/1ac9cde7a497051d3db966630e4ceb5a/14106291446.pdfIn PDF document text
    • http://aqua4you.hu/userfiles/file/xevewotetupofim.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/renajakuxasuriwek.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51418498767.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/vakaxon.pdfIn PDF document text
    • http://geasit.it/userfiles/files/gixos.pdfIn PDF document text
    • https://umutfm.com/resimler/files/55182009554.pdfIn PDF document text
    • http://urdu-hadith.com/survey/userfiles/files/53455031452.pdfIn PDF document text
    • http://come2menorca.com/images/file/25319791291.pdfIn PDF document text
    • https://portoggitter.no/content/files/userfiles/file///29225008430.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/jesajikuvivib.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/87952828823.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/bevadorobaja.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/salidovisuzudipudagimaxu.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/nasajaweziwebirofixan.pdfIn PDF document text
    • http://nceed.kr/pds/userfiles/files/fizoxegomotejif.pdfIn PDF document text
    • http://c-amc.com/upload/files/23137518323.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/52723418697.pdfIn PDF document text
    • http://chapelguild.com/images/usr/50333000423.pdfIn PDF document text
    • http://way-of-spirit.ru/upload/file/dixupovodakot.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/19574531485.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/zasibaj.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/22209206443.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/dagopixonevemi.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_off0000b2bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2BC 10696 bytes
SHA-256: f6e0341dfe536c0cd259acd134b12f45edb27e14de7dabecc48c15d4abc92d2a
font_01_sfnt_off0000caac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAC 16124 bytes
SHA-256: 413f20c56c9bdabbb813a41591da1e4bff9a873fb9e12f6ee0e245934c2d7edb
font_02_sfnt_off0000f39d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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