Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d113a0121cb1188…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 16:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e7374099a01dce3a1a396b6d99b89763 SHA-1: 802f49d41d41ded0e18d37c18971c8532eb31281 SHA-256: 1d113a0121cb11888a420df0206100e2d2e9c4b9840efdcdd02c3d957d1b0d85
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external files, many of which are hosted on disposable domains, suggesting a link farm designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a downloader or phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://websurin.net/UserFiles/File/gapaxunakamaluxuv.pdf In PDF document text
    • http://wmsone.com/eimages/file/tegategikunixovuga.pdfIn PDF document text
    • http://abcbyspu.com/ckfinder/images_store/files/nalubiseridibugumozu.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/60833019842.pdfIn PDF document text
    • http://farmaciafoglia.eu/userfiles/files/xariminidamobumipakedita.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/kogilekutasubowevago.pdfIn PDF document text
    • http://yuanjiangchem.com/upload/files/68980456261.pdfIn PDF document text
    • http://jcpingie.be/public/files/38806545517.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/mipididaxorekifezuju.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/90595569346.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/nuvatemafedupekesib.pdfIn PDF document text
    • https://lapakunited.com/contents/files/32479661244.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/depabuxisedajoxavaronidu.pdfIn PDF document text
    • http://showdoimovel.com/files/files/rolunodulekaroselomesulew.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161385c8ed4ac2---51868511699.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210908164520723.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/wumifidosumuva.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/jixiselaredoxuromoli.pdfIn PDF document text
    • http://cissi.it/userfiles/files/pasakumozusepazo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313b2c6db93---nefuzosemetonob.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/bofuxedimasukubet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=powerpoint+book+pdf+free+downloadPDF 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_off0000daf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF305 17356 bytes
SHA-256: 96b8defaaaae286e037664d57b058627dc27cdf173514c8dd9c6d49c2d3852a3
font_02_sfnt_off00011fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCC 10640 bytes
SHA-256: 219db341450efb3ee618ba9979f8ba77291e0fcbfc02fa51403e27ae5029bbcb

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