Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a581dc28e38b3bb…

MALICIOUS

PDF

75.9 KB Created: 2021-10-06 23:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8ea93b4d71605b5a823acf062c62e859 SHA-1: a952ed393f414c538656d221888486e1db02ae95 SHA-256: 7a581dc28e38b3bbbf66be2243b4b2086ee4663c5e9444075ab320570d3b5f4a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high number of distinct hosts and a suspicious link structure. While no scripts were explicitly extracted, the ML classifier strongly flagged the PDF as malicious, suggesting it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 4

  • 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://uralteplostroy.ru/content/file/38426765883.pdf In PDF document text
    • http://fullerton.kopanramen.com/uploads/files/508544770.pdfIn PDF document text
    • http://gptools.net/userfiles/file/tefizotijejekomudow.pdfIn PDF document text
    • http://yogasol.cz/ckfinder/userfiles/files/nenafirifitasiwamike.pdfIn PDF document text
    • http://mbfeed.vn/upload/files/luguroramatusemubiz.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/58720248468.pdfIn PDF document text
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/wixan.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/pobusadeluzutapo.pdfIn PDF document text
    • https://learn-atdi.com/uploads/files/3274367699.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/setogimupinajepukewe.pdfIn PDF document text
    • http://dentali.cz/files/files/bavivu.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe4487ddb---54326512875.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/guwesamuzamus.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/dolimejebamo.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/15300601700.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/jibepasunekuku.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/26638155545.pdfIn PDF document text
    • https://extractos.assaludips.com/Proyectos_PHP/gestor/images/file/garupakezasa.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/zumaguwaruvatedodibalak.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/megosaxiguwanilawapewub.pdfIn PDF document text
    • https://mu3yc792xh-rl1.com/contents/files/delutobojifaduzonomizafi.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/xemadetavavexabikaxike.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/33861875156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=common+size+statement+of+profit+and+loss+formatPDF 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_off0000c3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC11 10748 bytes
SHA-256: de150c3bd28b24ab000319462d68816c5fb8a93f20f4519485a038f0c8819e50
font_02_sfnt_off0000f4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D1 17312 bytes
SHA-256: 843f4df7219e26b975afbe7ff02c4ca1680e8d80f15ce7e2daf68392d6942a32

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