Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5b98564465d7f4…

MALICIOUS

PDF

84.8 KB Created: 2021-09-12 07:11:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: ee4c09e634cccaf5154735432483e0d9 SHA-1: 3530d423940688185dfdcb82a31577ddc9031edd SHA-256: 2a5b98564465d7f43c081daf2efa1f7b2770684729cf0913a9a69e5cd3d2bfd9
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-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://coretry.ru/uplcv?utm_term=my+phone+keeps+dying+fast PDF link annotation
    • https://embassyinvietnam.com/webroot/img/files/katasijasamalapekumutipo.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/48039179566.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/55640345576.pdfIn PDF document text
    • http://bhttourist.com/upload/fckimagesfile/dubuzozukoxemagiseluw.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/12673055487.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/95910364885.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/nuc8a763v1org0vvv0kvh26raa/xukexez.pdfIn PDF document text
    • http://laduses.nl/image/file/laraseru.pdfIn PDF document text
    • http://bjjiffy.com/upload/33927220212.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/68173971803.pdfIn PDF document text
    • http://szjglaw.com/uploadfile/file/2021090712144073499.pdfIn PDF document text
    • http://hanleyresources.com/images/12088831913.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/kikifojogubezagoxojal.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/tubovapezoxinegodenurivuf.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b6575e8202---71508331642.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/zulim.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/segadepagolanipak.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/mefizuvutuvutaxopuwiw.pdfIn PDF document text
    • http://prestopc.it/upload/file/dezupa.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/xulatazarixosu.pdfIn PDF document text
    • http://usairsprings.com/userfiles/file/92522306208.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/jitupezegizosi.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/73795731678.pdfIn PDF document text
    • http://chineseclothingonline.net/File/15406596710.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_off0000e4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4ED 18276 bytes
SHA-256: 9a96ad4cea795bef09f15a1df68b6f3cbb93882371e6c328676654635bfc38b0
font_01_sfnt_off000114c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CDC 10828 bytes
SHA-256: 077f07c97d67474eb232d18c0e69f3f4ca4e8798bb833ddeef4bf894e522b996

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