Malicious PDF — malware analysis report

Static analysis result for SHA-256 906d2753ed21041a…

MALICIOUS

PDF

83.9 KB Created: 2021-09-09 17:15:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d3c96775d5293cfe3dfc494526762f99 SHA-1: f4a0011fe5d381098a3e26ee8b287184376db299 SHA-256: 906d2753ed21041ae3393b3848c48ab595267e512ce77d6a9e8a8acec77bcb1e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest the PDF is intended to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://studio70.eu/userfiles/files/41130411658.pdf In PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/jadedofanosagikomefabe.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613704b34f33d---fozejafugodunowozuxolozo.pdfIn PDF document text
    • http://hodoan.net/userfiles/file/59577463136.pdfIn PDF document text
    • http://hrudolf.com/userfiles/gudiloropa.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/53699631539.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c92e5b98e---zoriripo.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/11661860970.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/75545925893.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/23478848800.pdfIn PDF document text
    • https://uangraja.com/contents/files/99658359244.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/potamalatev.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/papitagolotiboto.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/rovojebexolebebitezikod.pdfIn PDF document text
    • http://abwingstop.com/uploads/files/3315295413.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/92887456945.pdfIn PDF document text
    • https://bestofbucerias.com/upload/file/67927790876.pdfIn PDF document text
    • http://gmtshipping.com/attachment/file/20923085811.pdfIn PDF document text
    • http://www.horakgolf.cz/ckfinder/userfiles/files/likinitakukuwon.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/vabitozu.pdfIn PDF document text
    • http://jadeite.ru/images/file/dakixajufigoxu.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/26280712870.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/75476974104.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=fear+of+the+walking+dead+123moviesPDF 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_off0000e1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C6 11364 bytes
SHA-256: 3c2bd339b877927d9eaf835f35e70787f41dda06cb8ccb8abde8b386c39d48ed
font_02_sfnt_off0001144a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144A 17684 bytes
SHA-256: 4c943ec0ec7347c85e94d3307922b338fc2120406b16773b6d9cf1f4502d319f

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