Malicious PDF — malware analysis report

Static analysis result for SHA-256 64edbf2036cb0ac3…

MALICIOUS

PDF

70.1 KB Created: 2021-09-28 14:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cd4149bd3e581b60fbd185c7bccf4f67 SHA-1: 032bdf72b1b6cf8a20537e03380414b6459c4fd4 SHA-256: 64edbf2036cb0ac35e2fe458c3617e00787d9b410f4ab369f2493bb8595422bb
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. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links, likely to distribute malware or facilitate phishing. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://milosislandrooms.gr/userfiles/file/79149450298.pdf In PDF document text
    • http://mkngsp.ru/upload/files/82944927787.pdfIn PDF document text
    • https://pactforfamilies.org/ckfinder/userfiles/files/81090056970.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210905_160337.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/53049465791.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/74572193917.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/rivoxexuwizukuzakipen.pdfIn PDF document text
    • http://chamdure.com/DATA/files/voviralixipojugurilugosor.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/fesopojesewimoketa.pdfIn PDF document text
    • http://vanhacollection.com/images/files/bisupubelebedoserusufuja.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/vavujofafolozojewajal.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/29015249345.pdfIn PDF document text
    • https://cargotavio.ru/files/file/zaroniwoxefosubozev.pdfIn PDF document text
    • http://nktrading.qa/file/files/39207841826.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/82305104603.pdfIn PDF document text
    • https://mavibusiness.it/file/67405527018.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613496357aef0---jogosivo.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/18263212464.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/94056293842.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/silowukogajeruwimuba.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/wejajiwodutalerekafife.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/vuruj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=swift+stream+live+tv+download+apkPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/36211212854.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_off0000aeb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB5 10976 bytes
SHA-256: 1e2b551ae6bf57876c80de0ce9816a86fd4979c3486bd1eb38bbd5f84abf0d59
font_01_sfnt_off0000c838.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC838 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04A 16228 bytes
SHA-256: 6c208c621c4013fff140ff943e9512acadd238ec6cca3028e4e11d9f3d5f1fd4

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