Malicious PDF — malware analysis report

Static analysis result for SHA-256 579c9c2c70e6c5cf…

MALICIOUS

PDF

68.5 KB Created: 2021-09-18 10:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 07dac888e9a926fdd2e5648ae962da6c SHA-1: 14e459ae12e7ca7ae60f3b18f659117a6449d1d1 SHA-256: 579c9c2c70e6c5cfdcbde71079ba9986a3413b7d032ba01976294705daa6087c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The PDF contains a large number of embedded links pointing to various domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://oniceh.ru/uplcv?utm_term=clash+of+clans+hack+apk+ios PDF link annotation
    • https://pacientes.quiroser.com/UserFilesQUI/file/58230442899.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/65094516612.pdfIn PDF document text
    • http://101balkon.ru/upload/files/lejejinixorat.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/belajodagakirav.pdfIn PDF document text
    • http://chaukitchen.com/uploads/files/71465621637.pdfIn PDF document text
    • https://locoffice.ru/userfiles/file/67739214807.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/lopazasozunux.pdfIn PDF document text
    • http://snabsz.ru/ckfinder/userfiles/files/vojinapowuma.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/wojuwovalajis.pdfIn PDF document text
    • http://delve-cr.com/uploads/nuvejapuwe.pdfIn PDF document text
    • http://newworldss.com/uploads/file/35784651962.pdfIn PDF document text
    • http://foxhill101.com/userimages/jifupisejufaxik.pdfIn PDF document text
    • https://hotelcorona.ro/files/xedifizuzenufugivumadeze.pdfIn PDF document text
    • http://80tner.netsociality.com/upload/files/mazijejojixaxuvowexapuxe.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/pomowasaradomukuvapud.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/31150811904.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/15281704627.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/87180295370.pdfIn PDF document text
    • http://gibisch.info/files/files/motusikizufiwaxaxapadel.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16135b32543a67---miroladasokiwegimijatal.pdfIn PDF document text
    • https://groupunsur1.com/contents/files/75260127066.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/rovudotuzaxupovumumif.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_off0000af81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC793 14888 bytes
SHA-256: 15ca4f6e021ba87257c4a9b2a05bde48c0d33685fac569c71c78c6cd05c074c6
font_02_sfnt_off0000ecb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB6 10372 bytes
SHA-256: 40b25ab7123927e1a8f2c41fe3ea9e0c38f65c8d085d6dc041666adc13f401d3

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