Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7de87d4e5901d71…

MALICIOUS

PDF

85.7 KB Created: 2021-09-18 13:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fff1ff2c59256d229279b6d95365adb2 SHA-1: a35430e965e8dc900c70ba656edbd7fcfa7d54ed SHA-256: c7de87d4e5901d71dc12743cf2c65eed0ec0ba371e6455694b9fbc28f67e7134
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to potentially malicious domains, identified by heuristics as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the document structure and URL patterns are indicative of a malicious PDF.

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://inwebjor.ru/uplcv?utm_term=android+app+rating+dialog PDF link annotation
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614478526338e---4817228019.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///gebiri.pdfIn PDF document text
    • http://membranekeyboard.pl/_data/file/21156064558.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/35978105146.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/mixotivekiretemiveva.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/89639548975.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/67340429582.pdfIn PDF document text
    • http://tatagz.com/uploadfile/files/zidewudififep.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/jewisivibotiwobekudo.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/76685939901.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/48643024357.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/32375663652.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/53205125494.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/pigegilarijitominutibija.pdfIn PDF document text
    • http://nriloan.jctoursandtravels.in/files/femagikajud.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c032b7522e---xamefamutapodowewe.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/lubifixu.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/57250180109.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/84314322219.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/24800154120.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/lilipew.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/zadipebi.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/42676431893.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/44191218484.pdfIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/1468768215.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_off0000eb23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB23 10248 bytes
SHA-256: 3af936f47d723d4ffbc52d345da3133477238a9c312764ec98882b18415b200c
font_01_sfnt_off00010201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A13 18056 bytes
SHA-256: fe46c2c88f953d250c6f402e9e2a6e1e1a7916daf800f070809b02f5c1d1797e

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