Malicious PDF — malware analysis report

Static analysis result for SHA-256 e03d63ab13462109…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 18:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 81b452f7ea94a83a74374a15da1af7db SHA-1: 538a9eb8a12ceb5e133d1d6996059c016eca376b SHA-256: e03d63ab134621094f8e07e813d2ea3b1ed119325ab48fd9ab66119d58caef01
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://synerhu.ru/uplcv?utm_term=jorge+luis+borges+libro+de+sue%C3%B1os+pdf PDF link annotation
    • https://martensmgt.com/business_school/uploads/file/fuputepabopijefufef.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/77678025234.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/33596771841.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/63982719608.pdfIn PDF document text
    • http://www.77ice.com/upload/files/luminamotujukoxanemekuni.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/lulimafinasisuloxanugil.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/77157cadb0ad863b1cd6d9393395fc75/92894129237.pdfIn PDF document text
    • http://hagithanh.hagigroup.work/data/media/files/pujipevikovivadomali.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c657366d6a5---matimizakowiweporanes.pdfIn PDF document text
    • http://zuche0551.com/upload/file/jejixazof.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/teriwixa.pdfIn PDF document text
    • http://asztalosweb.hu/userfiles/file/34523751958.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/75948794668.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/dimawezudaw.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/16835812265.pdfIn PDF document text
    • http://energo-winstal.pl/userfiles/file/73975522474.pdfIn PDF document text
    • http://billsky.ee/files/file/zosevixu.pdfIn PDF document text
    • http://w-mill.jp/images/file/ruzuxuj.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/xokozef.pdfIn PDF document text
    • https://www.cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/14536841963.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/pefugisafipogef.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/napokonaxu.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/voxipukatazumexobemab.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/43454770687.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_off0000d5cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CB 20004 bytes
SHA-256: 771a56cc116d745fcb2fc98438c91eb7e5e608a87ab33806ac281d4c979d84eb
font_01_sfnt_off000109b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109B0 10748 bytes
SHA-256: aa0576e367c09b8139e336889f5ad3e9cdb43a0a97ea9bf861e60dfa91c71027
font_02_sfnt_off0001220a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1220A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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