Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b12372892c94187…

MALICIOUS

PDF

76.9 KB Created: 2021-09-11 04:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 71636989042947d7fd4a29b4e417dd4d SHA-1: 2817f371979a5c84c811185f1fe51cf7ba458c29 SHA-256: 8b12372892c9418704bb156124c00be15aa302aef21cbfd2259e8e1ede4104b2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting a phishing or malware distribution attempt. While no scripts were extracted, the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://wastran.ru/uplcv?utm_term=safe+torrent+sites+to+download+movies PDF link annotation
    • http://toyotarent.hk/FileData/ckfinder/files/20210909_D6A0555D715AC692.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/35554785285.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/60739683228.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/zoguzotusefulamotewude.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae11ab8859---gilofivanam.pdfIn PDF document text
    • http://skncn.com/u/files/zubisijakobetafijuligob.pdfIn PDF document text
    • https://hobbypet.cz/files/file/82449040750.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/tatokoxut.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/99422173545.pdfIn PDF document text
    • http://vakoplus.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/85844850684.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/jurubabixog.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/mitewomokepum.pdfIn PDF document text
    • http://laserinnsbruck.com/static/kevirujadelokijasub.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/61012607040.pdfIn PDF document text
    • https://csodamalom.hu/files/files/nogubigalida.pdfIn PDF document text
    • http://grandfiltr.com/files/file/lelaxilesinewekak.pdfIn PDF document text
    • http://bifruit.mk/ckfinder/userfiles/files/55350647702.pdfIn PDF document text
    • http://bilcafe.it/userfiles/file/petima.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/puvagapimutuwologebiwebid.pdfIn PDF document text
    • https://mcsfood.com/images/file/54390958698.pdfIn PDF document text
    • http://www.samuitns.com/image/upload/File/wodesar.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/76071993012.pdfIn PDF document text
    • https://terracell.pt/images/file/lesezajodi.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/22177943787.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_off0000c9cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CD 17292 bytes
SHA-256: 65bd20d112b9c462f098d7e5fdee420ecc7d672f7fc0bcefaf0d9b38b37822a9
font_01_sfnt_off0000f52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D44 10740 bytes
SHA-256: e0436521bb842b99dc40a429c38d8eee6c21e579efe529cb49005bf1c34279cd

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