Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca1e9747f9ce29c2…

MALICIOUS

PDF

70.5 KB Created: 2021-09-15 11:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dc4235c1d51c3ab5d4db4bdd9f461381 SHA-1: 7f79751cf9f34cc1ff728dd089617580233a5021 SHA-256: ca1e9747f9ce29c29ccd0fa247752297ee9626000e5af7251fc6d345ffcaa2e9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many of which point to disposable domains or are structured as link farms, indicating a phishing or malware distribution attempt. The presence of external URIs and the ML classification strongly suggest a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=clean+master+mguard PDF link annotation
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/bukagorurusoxabuta.pdfIn PDF document text
    • http://i-akparat.kz/ckfinder/userfiles/files/roxawipapujozapuzepujuxom.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/tuwikunobi.pdfIn PDF document text
    • http://podushka.by/files/files/12298068495.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/biwokefijedu.pdfIn PDF document text
    • http://specimport.by/files/files/zatezikexuzejokexu.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/fumalume.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/10462222812.pdfIn PDF document text
    • http://centromp.it/userfiles/files/fowiwofamakitufeposaru.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/56309314424.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/31960784232.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210902_152053.pdfIn PDF document text
    • http://mascotdd.com/file_media/file_image/file/1096017714.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/wekogakajigunuzugitufug.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb3b6a1431---pelanedovef.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/koserod.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/dbb9ca60ccdbf182a92e3a0c4390c4c8/17827456209.pdfIn PDF document text
    • http://electric-kernbichler.at/47594224000.pdfIn PDF document text
    • http://manhchenang.vn/webroot/img/files/badisufufib.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/73250633394.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/gadigigo.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/31406318571.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/jodipamazil.pdfIn PDF document text
    • http://ggbris.com/slbdavbatala/userfiles/file/72922893087.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_off0000b29e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB29E 16556 bytes
SHA-256: 30132acd99217109150e9c7fe104e75904f83088a2f1789a05b9fc74971a59d4
font_01_sfnt_off0000dcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E7 10512 bytes
SHA-256: 76f908d3954167326ee624ca84034ba1fff987852158cb8f7d454a6c88e29e68

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