Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e6dfa7f17a2d42…

MALICIOUS

PDF

84.5 KB Created: 2021-09-17 04:25:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: c313302ab6976bceb4f12733d98a3d00 SHA-1: cc0480390b6c4f2ac5fe67aadd47af3eff28cafd SHA-256: b7e6dfa7f17a2d426578ccd09dc5ee926fac3b57c8c406c0c01de0d883dcde1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://nadafashionbelt.com/Uploads/file/wawufenivitajujanedaze.pdf In PDF document text
    • http://group-anons.ru/userfiles/files/62675267223.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/xanonadopov.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021090210442573499.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/folesuxafiwakazipetu.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/161368728263fc---81428700170.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/71621402708.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/93379279950.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/94595226908.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/11719916587.pdfIn PDF document text
    • http://onsijsselstein.nl/userfiles/files/10594054536.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353e3e1ba04---liwomubagogibam.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/wefutavavanejazaxoperaj.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/27485874294.pdfIn PDF document text
    • https://tutorbolivia.com/userfiles/file/78760863804.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/85428629616.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/14990040526.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/23184933889.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/19141500554.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/vivajog.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/98146868146.pdfIn PDF document text
    • http://slsnn.ru/content/files/59502149435.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/nisisedolewibawekuxeladi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=cara+transfer+kontak+dari+iphone+ke+iphonePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD143 16344 bytes
SHA-256: 756b691c13b983eafa03e47aa9f0b6ad58d5b72d5a208688d70894321573a878
font_01_sfnt_off0000e76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76F 10672 bytes
SHA-256: b52cf0d1d195e395a9d1857fe30cf0522c75a5e0de57477db08af0bf1350f4eb
font_02_sfnt_off0000ffde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000117f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F0 16640 bytes
SHA-256: 37dae6df60c84d229092a9f16c808d7ae7d9d1819b57dabf22b686b24349dbbd

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