Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e23ff0a06282318…

MALICIOUS

PDF

87.1 KB Created: 2021-09-09 03:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1299f9668af7f33ffeff1b0a76c82c21 SHA-1: 2879dfe545b48538683fe46d7c64cb0d53bd20b6 SHA-256: 3e23ff0a062823185378b8ab63057da1fd47f76b3d001e287e4a324cc72d6945
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic analysis indicates it functions as a link farm, directing users to numerous external domains, many of which are suspicious. While no scripts were explicitly extracted, the nature of the link farm and the PDF format suggest potential for embedded JavaScript or other exploit vectors to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://nasco-ye.com/uploads/file/21854006551.pdf In PDF document text
    • https://moiatakashta.com/userfiles/file/27444079918.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/91807708899.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/18363c4d43d489b6b2a066c1562fc457/42221068264.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/47194202636.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/siwotivojikewunepoj.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/vusenizudurupulot.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/19275042326.pdfIn PDF document text
    • http://htygroup.com/upload/files/47687764386.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/xezosatumefidakajisibi.pdfIn PDF document text
    • http://ourconn.com/userfiles/file/202109082204359359.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f40ebd934---ruduloduwabaloke.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/zubafekogamurawurevavuz.pdfIn PDF document text
    • http://fujiya-burbank.com/uploads/files/rivakifobanew.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/kaxekunarawunulijuxumib.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/suremejajoteganar.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/jaseze.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/72816192671.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///xexapatagenosit.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/tafejavikomilipet.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/32696805387.pdfIn PDF document text
    • http://jump360.co/upload/files/20210902040011.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=el+mejor+juego+de+pool+para+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_off0000ebbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000103d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D1 19536 bytes
SHA-256: 71e52e6f0eab270745566e3287ac459f3578eca88fa42429c84d6fb42b34e086
font_02_sfnt_off0001361f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1361F 10684 bytes
SHA-256: 7ba63e791f7f0ec5f8216ea91602d94b3d804f929325368ffa78017a95c41c63

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