Malicious PDF — malware analysis report

Static analysis result for SHA-256 37c3bcffd437a6e0…

MALICIOUS

PDF

68.5 KB Created: 2021-09-24 22:53:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7234de3dd6695dc16a5376eb881f0988 SHA-1: 988a35d5e697e7b712ca18c9dcdffdf965f99341 SHA-256: 37c3bcffd437a6e0102af12399a350e828017981ae5fb62cb512dc9fbc6814d6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to link farms, indicating a likely phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the PDF is designed to obscure the true destination of its links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://eventaipei.com/upload/files/47259925618.pdf
    • https://cyberbirddog.com/userfiles/files/vapeduxadi.pdf
    • http://debeight.net/UserFiles/File/41279024401.pdf
    • https://ngusacdon.com/upload/files/kiwabativumewajavimawel.pdf
    • http://garantc.ru/userfiles/file/44499123861.pdf
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/mebaneturemolafedutamu.pdf
    • https://qpshouse.com/upload/image/file/wefulowugoda.pdf
    • http://ydis.kr/userfiles/file/031515556020.pdf
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/83486704994.pdf
    • https://ubk-sad.de/azubi/userfiles/files/mililolegurapiwo.pdf
    • http://sm300159.agchost.com/userfiles/files/98523712661.pdf
    • https://matharu.ae/userfiles/file/52933691035.pdf
    • http://musorcentrum.around.hu/files/article/file/zewosazamobupinow.pdf
    • https://nls.vn/upload/files/90915951823.pdf
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/2p3roi7k8verugvgv294rqpmd9/demoleduvekigirodegawim.pdf
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4b5483d1d---lesovipomoboxoxikugokovaf.pdf
    • https://phukienbep.net/media/files/86356766054.pdf
    • http://abwrichmond.com/uploads/files/46300489853.pdf
    • https://magyar-logyogyasz.hu/fileok/file/rovanubixamojeduguzoxuna.pdf
    • http://artstudiodesign.it/userfiles/files/54447685556.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=hunter+hunter+chimera+ant
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000aef5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEF5 16792 bytes
font_01_sfnt_off0000c707.bin
aa6a74290fda688069458362a7a11828a411e4a88fe9567816e4f14422d79837		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC707 15540 bytes
font_02_sfnt_off0000edd5.bin
8c5048fa9c1463f9d38b5ec8e47cd98b1905aec242ad38e2e0bf14b2d2ff8ebd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD5 10252 bytes

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