Malicious PDF — malware analysis report

Static analysis result for SHA-256 433428117e03e878…

MALICIOUS

PDF

78.2 KB Created: 2021-09-15 22:29:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8369854b5daee374f7d959b402c42a6 SHA-1: ae1dd69708c68ba87ede20502adbbe3365843661 SHA-256: 433428117e03e87859ae46da835398a3c5d5620392d28bbdcd874792231f866e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one specifically noted as a redirector, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URLs point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://chcial.ru/uplcv?utm_term=android+messages+location PDF link annotation
    • https://lemarko.com/userfiles/file/dopik.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/82596017505.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/96746103105.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/jamijalofodigonekoxo.pdfIn PDF document text
    • http://wizclub.net/upload/userfiles/file/fikavuzujewupotiru.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/xolutegigojorizasigepuxe.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/40094137486.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/29070723292.pdfIn PDF document text
    • http://salt17.com/userfiles/files/siruki.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/61363557004.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/kalimasexefikogufudezix.pdfIn PDF document text
    • http://fkjz.cn/upload/files/2021/09/202109160013252447.pdfIn PDF document text
    • http://jatechkj.pl/upload/fck/file/dotozawufotimarunifap.pdfIn PDF document text
    • https://strategie-forex.com/ckfinder/userfiles/files/midesijo.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/tefuwu.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/6125879261.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/101126009280.pdfIn PDF document text
    • https://digireg.gr/upload/tatuzofujezatofuzov.pdfIn PDF document text
    • http://efeteknikyapi.com/userfiles/files/tikeviwiwipavekozezo.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/niwomipofibiwesaxurelowi.pdfIn PDF document text
    • https://htlexpress.com/ckfinder/userfiles/files/lokarotolakidetale.pdfIn PDF document text
    • https://andana.us/files/files/litelusik.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/24120854444.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130753192023---tugosakukunurozusu.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_off0000cecb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCECB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DD 17056 bytes
SHA-256: 7687ac83b0b71901f0bc2e6d352e00406639f01f3c7e32e3a051e28c916cf57e
font_02_sfnt_off00011317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11317 10696 bytes
SHA-256: 53c4613156afeb8f266b9fb2e2eb22a098b44119e05862588fe3dda3926769e5

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