Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c6becb9dca2c13…

MALICIOUS

PDF

85.0 KB Created: 2021-09-17 23:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 9cb8824e9c7e52d25e9e5b918a1b4e13 SHA-1: 186028851c69c2798f4ee4879e8c9566440556ba SHA-256: 16c6becb9dca2c13a0efab24bdec5afd6588127a6c7147a5c4048c970b0dc34f
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 0.9974

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://wheelmartthailand.com/image/upload/File/22128241508.pdf In PDF document text
    • http://laserbeautymachine.net/d/files/gewolug.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135baa6843d5---fovuwi.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/13850776059.pdfIn PDF document text
    • http://dgjst.com/upfile/file/solavarawoxibegiv.pdfIn PDF document text
    • https://tidymoney.com/ckfinder/userfiles/files/1971613483.pdfIn PDF document text
    • http://akpanlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/12306491607.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/9a9d61ce752ce92f7355b4203a1ffb93/fotodovopuwofinidizizal.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/97173966274.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/58251004985.pdfIn PDF document text
    • http://haki.vn/uploads/files/buripapazutavoxugeduxoreb.pdfIn PDF document text
    • http://konditsionery-reutov.ru/upload_picture/file/22807805457.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/mubinuxogimu.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/kutogemivuvexowa.pdfIn PDF document text
    • http://polishingmarblefloor.it/userfiles/files/94291918898.pdfIn PDF document text
    • http://betonkeritesek.eu/Content/files/6254972363.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0492644001631724295.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/voxawokuwidefo.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/11028956515.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613a89aa50c34---vugesudobirifiva.pdfIn PDF document text
    • https://www.serwkom.pl/plugins/ckfinder/userfiles/files/degujagapasavumesujudu.pdfIn PDF document text
    • https://resulgame.com/calisma2/files/uploads/borekafukagexozajobipux.pdfIn PDF document text
    • http://www.amedna.com/userfiles/files/nawobopesusobopep.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/favasedakalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=fortnite+free+v+bucks+code+generatorPDF 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_off0000e73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73A 17500 bytes
SHA-256: 3a4ea3d842f3b4a994f4e76bad7f6f03adf03a72d41189d52cf7a00b74f28983
font_01_sfnt_off0001149d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB4 10980 bytes
SHA-256: 9907725dc80b53823600c43b9853e9a049b1c073f1f293d74aadb4c481e4d3a7

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