Malicious PDF — malware analysis report

Static analysis result for SHA-256 7de6cb35ecc999fb…

MALICIOUS

PDF

77.3 KB Created: 2021-09-15 15:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4b06a5afbfbe21b568c73f9f8760ac3 SHA-1: a096ccff6fc7464dbd1ab2ebd3a25083de4c461c SHA-256: 7de6cb35ecc999fb4443758361667975ff9a02a058e3a91af3f9d02202c8f8ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is a link farm on disposable hosting, with numerous distinct hosts and a UTM term redirector, suggesting a phishing or malware distribution attempt. The embedded URLs further support this, directing users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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.
  • 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 http://familiegravesen.dk/ckfinder/userfiles/files/38558625271.pdf In PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/33da335966809270df743cd0a3e77264/4512979843.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/sadanonifepalobuj.pdfIn PDF document text
    • https://securitydm.com/slicice/file/26130922905.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///49335663223.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/17352776864.pdfIn PDF document text
    • http://ztracenaexistence.cz/files/content/file/raduwepezuwimaxosu.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/55334091288.pdfIn PDF document text
    • http://agro-partner.com/Image/files/lidimopikepewurufekuri.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcc38eeb82---39826346289.pdfIn PDF document text
    • http://knipia.com/userfiles/file/lanuxinuvaxiku.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/41644454429.pdfIn PDF document text
    • https://mokhalasati.com/userfiles/files/3965524544.pdfIn PDF document text
    • http://szilasfood.hu/pic_upload/files/71071223276.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-15/20210915204212631052.pdfIn PDF document text
    • http://opusincertum.it/userfiles/files/90005408379.pdfIn PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/rajowovulobog.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109041945428833.pdfIn PDF document text
    • http://leeclinic.kr/userData/board/file/39436221135.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/pexuvir.pdfIn PDF document text
    • https://geelaboba.dswip.com/ci/userfiles/files/12099270859.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/kurogizokopivexufejoduzev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+grand+mafia+mod+apk+offlinePDF 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_off0000c9b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B6 10732 bytes
SHA-256: aa8cb6585ad523b5bac78bc9ca8c1f0ecd1baf2fc5331e9e4632f6320553004f
font_01_sfnt_off0000e1df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1DF 17736 bytes
SHA-256: 2e7d02eaecb583fcef6ab9efa532f88be376e75bde6402dff6f6f859494ef364
font_02_sfnt_off0001102b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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