Malicious PDF — malware analysis report

Static analysis result for SHA-256 17533007aa078fc7…

MALICIOUS

PDF

93.9 KB Created: 2021-09-14 06:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 43a0c651451576602c6e6e4e1a1b74d7 SHA-1: a4cd8ce6d1a140fa3516d612acaafc74c2cc87d0 SHA-256: 17533007aa078fc726b59b26e5ecdda64d16e9e9041407a1fe9c31be1a62567c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used for phishing or to distribute malware by directing users to a large number of potentially malicious sites. The ML classifier and ClamAV detection strongly support its malicious nature.

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://philabc.ru/uplcv?utm_term=instagram+followers+trial+1000 PDF link annotation
    • http://krukaiart.com/userfiles/files/rovotiboxedolamoruxo.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/vepumomopuruzos.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/4944c40d5a5c97146fa728b484a9757a/82160015669.pdfIn PDF document text
    • http://philipsphotographystudio.com/290074691.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/51730502040.pdfIn PDF document text
    • http://rafaelokazakov.com/file/vamoxover.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/jetibozukexakukun.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/92487013697.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/jijipi.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d988a966d6---21416782669.pdfIn PDF document text
    • https://limsurempat.com/contents/files/zonesiful.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/58145145927.pdfIn PDF document text
    • http://efrex.cz/files/file/wifopisix.pdfIn PDF document text
    • http://artemon.nl/userfiles/file/pofegokafexigepewavekel.pdfIn PDF document text
    • https://lorus.rs/files/24220013494.pdfIn PDF document text
    • https://euchebnici.com/img/file/18580213841.pdfIn PDF document text
    • http://showdoimovel.com/files/files/44413801793.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/pewizojagiwadaxebagepu.pdfIn PDF document text
    • https://artistprasanna.com/userfiles/file/85249080029.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/40032144110.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/jijujurenarizurif.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/34130663806.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_off00010995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10995 10768 bytes
SHA-256: f743e8052eeb3d1863c8ea7cb41e7700f48bf58b96e14cc4cc5df03d489640fe
font_01_sfnt_off0001226f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226F 18416 bytes
SHA-256: ff7e1f223e94170021f01bb353b9554fdf4a8d8147c74493f72d15936ff5513e
font_02_sfnt_off00015253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15253 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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