Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c83a52a34697ca1…

MALICIOUS

PDF

82.4 KB Created: 2021-09-22 13:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 373cefc992723bf438a9ba9691e9a674 SHA-1: f01adf04a1f0a85367b580a608f29e291346fe9c SHA-256: 6c83a52a34697ca17fada11416a063c6b5d7e100c10d8f61d12fbe7e0365b783
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of embedded JavaScript and a large number of external URIs, many pointing to disposable domains, indicates a phishing or credential harvesting attempt. The document body is heavily obfuscated, but the heuristics strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=how+to+address+a+letter+envelope PDF link annotation
    • http://ymjgolf.com/file_media/file_image/file/25824532249.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/dogabegoguloxemubavaz.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/konusanitapirijasexaz.pdfIn PDF document text
    • http://itagqatar.com/itag/file/files/66871760102.pdfIn PDF document text
    • https://msiutilities.net/documents/sobinavimusaloluziwibir.pdfIn PDF document text
    • http://candientuvibra.com/images/file/93813669544.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/legibowivepeman.pdfIn PDF document text
    • https://mamadona.ru/ckfinder/userfiles/files/sepizepewibun.pdfIn PDF document text
    • https://nazrabilisim.com/calisma2/files/uploads/palevulefuzezunapef.pdfIn PDF document text
    • https://longhoang.vn/upload/files/zirasuseke.pdfIn PDF document text
    • https://pieseautocomenzi.ro/userfiles/file/23434763404.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1614877b653ea5---4832012100.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16141903bf08a6---74464737573.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/pikilotalopugel.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/ch2ff9i6bvp4q1luvpdbsa5qsq/jetep.pdfIn PDF document text
    • https://resonanceacteurs.nl/userfiles/file/dedefufajapasunev.pdfIn PDF document text
    • https://revive.fashion/upload/files/26304572112.pdfIn PDF document text
    • http://ladna.pl/user_images/file/tifaw.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/wobaxekajilozuzonaguwupi.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/jedikekibodigilepugu.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/99197156110.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/sodeka.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/wuwedilider.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/dazoge.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/jepavofasetupivekatekem.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_off0000ddd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD6 17716 bytes
SHA-256: 9ff327b0549dcb8c1a1e60f9aeec0634052c4a688bc26e4930a4b25707cef97a
font_01_sfnt_off00010baf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123C6 10436 bytes
SHA-256: bbdee146a863527cd39734a77beaf0e37d2d4d80fd8499a23cdfa77e78772ed7