Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2aa19755a368b89…

MALICIOUS

PDF

69.7 KB Created: 2021-09-23 06:52:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 784e8117d2405855748275169619b372 SHA-1: ad69eb90c8a35504aff9776c2d114805b785ab43 SHA-256: a2aa19755a368b89598a5d81afbf2948b91eb4fa3059a47593441a7020d7d1ab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=internet+explorer+delete+temporary+internet+files PDF link annotation
    • https://www.abrasco.org.br/ckfinder/userfiles/files/28333006120.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/89815797802.pdfIn PDF document text
    • https://moyaexpresss.com/ckfinder/userfiles/files/70890814108.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/pubaxupakupuzakipol.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/pafukulasux.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/58629056347.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/pobajolunejasulepu.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/zajiror.pdfIn PDF document text
    • http://schturman.ru/files/files/goripede.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-9-9/20210909135253568142.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/taxezipirutopinamexe.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/ab5c9gfj9h9bfpbabbhkq60uh4/jexadopokosuzaxan.pdfIn PDF document text
    • https://073741256.com/uploads/files/202109030418283936.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/ruvuxewero.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/98275636036.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/vukumuroti.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/ledomerelupejesenogurume.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/q3c3l401um2u8b9frlrbpil5a4/65274293514.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/41029277563.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93003583831.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/42815764584.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/wifidozodadasolafusig.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/47148510772.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_off0000b07a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB07A 10828 bytes
SHA-256: 78e16b993627b917cb3a388628c045074bc1a179f6673325494ec2bfac5f7f0b
font_01_sfnt_off0000c970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC970 15484 bytes
SHA-256: 73ff75f79bf843c07e3a746a41167abc87265a08cce157323896f1d37c5363e1
font_02_sfnt_off0000f111.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF111 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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