Malicious PDF — malware analysis report

Static analysis result for SHA-256 6635ad992a847cfb…

MALICIOUS

PDF

70.4 KB Created: 2021-09-28 00:53:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 77db0a7fbba6196624119c937e231e54 SHA-1: d8b044e333facc9d7882c8604fd43825b70bf500 SHA-256: 6635ad992a847cfb4331d7fb085a5789dc025d310d933c1de5dd9b7e0d06d3e5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external links, many of which point to disposable domains. This behavior, combined with ClamAV detection as Pdf.Phishing.Trojan, strongly suggests a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection or execution of malicious content from these external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=sony+xperia+play+store PDF link annotation
    • https://faktxeber.com/resimler/files/53275528684.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109112107249962.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/biluvezawubi.pdfIn PDF document text
    • http://pinxedien.net/upload/files/konesorikolakole.pdfIn PDF document text
    • http://wixoon.hu/upload/file/26800795761.pdfIn PDF document text
    • http://studiotecnicoforace.eu/userfiles/files/modudetiriravoruzugedajar.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/49161240308.pdfIn PDF document text
    • https://kotata-zlin.cz/obr/clanky/file/24289330945.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/sozugolupol.pdfIn PDF document text
    • https://granitnet.hu/editor_up/94856248549.pdfIn PDF document text
    • https://crcnueva.naturasoftware.com/uploads/images/files/7445009604.pdfIn PDF document text
    • http://blccy.com/userfiles/files/poburalovenikavakapa.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/gebuduv.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/fugikuz.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/bofuzizojigivugupi.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/34172407193.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/34879554350.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161523440da4e5---46183620770.pdfIn PDF document text
    • http://klaaswester.nl/img/file/fanelafipavazugedo.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152393b34ae3---77988067205.pdfIn PDF document text
    • http://m-camper.ru/ckfinder/userfiles/files/18415969294.pdfIn PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/rapiwonoburemowowo.pdfIn PDF document text
    • http://meskerjager.nl/media/files/57754246984.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_off0000b107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB107 10536 bytes
SHA-256: c767677e2c45358557f2328d7713818122786a26b5c0a3053ea914d6beff04ed
font_01_sfnt_off0000c92c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC92C 16760 bytes
SHA-256: 9a557c9b35489411b288c1ef2c12ccef0a536c1c656b7ebf9fdfcc37f25625a4
font_02_sfnt_off0000f455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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