Malicious PDF — malware analysis report

Static analysis result for SHA-256 e686b0b5d1cd4f4c…

MALICIOUS

PDF

70.7 KB Created: 2021-09-28 08:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d3857ba9e7cd23b42abbe6a98793bb3 SHA-1: 2ab005af9379e886527c09b1eefea1338fef052a SHA-256: e686b0b5d1cd4f4c91f1f736f0f1702e3dc14d7a60f42b0582dfc60b00503e63
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which are hosted on potentially disposable domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to redirect users to multiple external sites. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://happy-land.hu/editor_up/juxoza.pdf In PDF document text
    • https://mmeasar.com/mmeasarfiles/file/fumurixiv.pdfIn PDF document text
    • http://dsfly.com/uploads/files/63405891015.pdfIn PDF document text
    • http://hdg-gmuend.de/userfiles/files/21759753180.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/34509280983.pdfIn PDF document text
    • https://camphacement.vn/upload/files/lejoforozosolawew.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133bf5d5335b---93494183711.pdfIn PDF document text
    • https://maymac.info/userfiles/file/41166879984.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210904134129_378230265.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/kofidal.pdfIn PDF document text
    • http://davcpundri.com/css/file/97416743895.pdfIn PDF document text
    • https://pastijptoto.com/contents/files/66896091368.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/89587795597.pdfIn PDF document text
    • http://schule.havonix.com/ckfinder/userfiles/files/luromubilasapinopo.pdfIn PDF document text
    • https://ngonluathan.com/images/ckeditor/files/fibipi.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/vikewitugitofolupaxu.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/leminexefagafujofeverumu.pdfIn PDF document text
    • http://6nergy.fr/6nergy/sites/default/user/file/zefomivutosorune.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/37621654098.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/mutokemunofapipezikivov.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/90430797105.pdfIn PDF document text
    • http://simpelms.nl/userfiles/files/zamawe.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/40973975182.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb146242ea---goxaxedemuxopunozel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=set+homepage+chrome+androidPDF 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_off0000b072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB072 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC884 17156 bytes
SHA-256: a864499d6ee24028fabbf841aba1e48e6a01718b679d46932da3fed939e03d03
font_02_sfnt_off0000f4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AE 10824 bytes
SHA-256: 3f0f1d8074ee0e7518394727736e9cee18009d8ba0871fe0645fe3ea40262760

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