Malicious PDF — malware analysis report

Static analysis result for SHA-256 966d9ac231e55f8a…

MALICIOUS

PDF

69.1 KB Created: 2021-09-10 12:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 12fb709f6771895af913dd394a7d7bf8 SHA-1: 5e7998027ad6798ff562885ccdcb5d0a0a970083 SHA-256: 966d9ac231e55f8a5c3597d33a19411819a7db277bb21a23bbc457dfdbe99a6a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs, including a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF structure and embedded URLs indicate a likely spearphishing attachment, aiming to lure victims to download further payloads or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 5

  • 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.
  • 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://philabc.ru/uplcv?utm_term=fifa+19+free+download+for+android PDF link annotation
    • https://vipbeachhouse.com/uploads/editor/file/wolivadisotugi.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131f4541f55f---gutogelalulawanoz.pdfIn PDF document text
    • http://3qbuy.com/CKEdit/upload/files/sobubopitowekegu.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/rakojoxekali.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/24701545996.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/5821252322.pdfIn PDF document text
    • http://mwcapital.net/ckfinder/userfiles/files/xifewuzubivefubefotuj.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/wozemij.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/a90sh4mjdb4ke7pvhl8avpaeg4/97015237395.pdfIn PDF document text
    • https://ratodua.com/contents/files/bapedi.pdfIn PDF document text
    • http://www.smwiarus.pl/ckfinder/userfiles/files/49416464328.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1631236563/file/46537262060.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/64195394970.pdfIn PDF document text
    • https://greenlakepaint.com/ckfinder/userfiles/files/zulexuza.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/xozenivoparewader.pdfIn PDF document text
    • http://stagelight.pl/userfiles/files/73161287747.pdfIn PDF document text
    • http://immobilieninvestors.com/userfiles/file/kekutadu.pdfIn PDF document text
    • https://ocw.tw/uploads/files/91588740694.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/89630950421.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210904_0DCF5F3E1C756A1B.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/pesogurimesexaz.pdfIn PDF document text
    • http://rewitex.pl/userfiles/file/pimotodawegarom.pdfIn PDF document text
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/30418585655.pdfIn PDF document text
    • http://mp-journal.com/media/file/81331727957.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/10763027475.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/15561781309.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_off0000b1a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A2 14836 bytes
SHA-256: 42c3107eb79ef6338b511d53315880b04a2eed3486b7f8a8e31bf776072b6428
font_01_sfnt_off0000d6ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF05 10364 bytes
SHA-256: 76c295a6a7487109e0953788bc22ee12da7be1e41e966be2aee5cab2651ceddd