Malicious PDF — malware analysis report

Static analysis result for SHA-256 daa09ae476192a11…

MALICIOUS

PDF

81.1 KB Created: 2021-09-21 04:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 664be244c5ec14de2e52dc1a0923d46d SHA-1: 3b26d8907ece17a06b013493acc97a52a0ad7acf SHA-256: daa09ae476192a11e6f5bccf31827c3911add5649f1aac46a4371799012895d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and form a link farm, suggesting a phishing or redirection attempt. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd40e6e2eb---bunutonexol.pdf In PDF document text
    • https://agrimal.pl/userfiles/file/gejow.pdfIn PDF document text
    • http://plaschke-partner.com/uploaded/file/pafevigexumojumuginib.pdfIn PDF document text
    • http://www.eatvirukai.lt/uploads/files/lefuladenuxirewotusirare.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/84169709186.pdfIn PDF document text
    • http://prosquash.by/data/zumiwuxikewogenibive.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/93998699407.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/xitujarevox.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/dewelifisu.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/94704391465.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/c768817c1dc519e016e56dd3f7a1404f/82295196540.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/bononodizikopexeju.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/dobogotuzuwovosaloxepewo.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/55586093690.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/pelufeberi.pdfIn PDF document text
    • http://ky-auto.com/uploadfile/files/6584196144.pdfIn PDF document text
    • http://domgr11.ru/uploads/files/mojizemav.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/vukipagemuto.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/54375780928.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/13472648001.pdfIn PDF document text
    • http://ctcinsulator.com/uploads/file/zemotubuxibejiwajakupa.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/73624713498.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/mojozimokinopefare.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=2+one+for+all+my+hero+academiaPDF 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_off0000d6e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF7 10612 bytes
SHA-256: a51acc0c9bff802ce2756327ae5b3ac25f7c35a0dcae45d43903c27aee8e09be
font_02_sfnt_off00010706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10706 18528 bytes
SHA-256: 01e09ad810de736c72a966138a1691ad4e977f24143b6c74fbc57c67c697c508

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