Malicious PDF — malware analysis report

Static analysis result for SHA-256 c994010f2fd47e02…

MALICIOUS

PDF

71.7 KB Created: 2021-09-12 13:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c763e2dff5c18c4aae81391fcbde07ee SHA-1: 6f9176be124e54eb996279c6df6aa29ba50023f0 SHA-256: c994010f2fd47e0226d6ee2da4d6bb668a6ed32f519fa07ab0920268eb956e74
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and utilize UTM parameters, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=eye+movie+app PDF link annotation
    • http://www.prieteniitehnicii.ro/documente/file/75015560159.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109020204456986.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613719dd36214---votukisiwaregola.pdfIn PDF document text
    • http://logenamerica.com/userfiles/file/sotadokadoparuvipame.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/pemutezasa.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161313af033a62---sukedevotepin.pdfIn PDF document text
    • http://qdjshg.com/files/file/xepefuzewuwofiwirozus.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/92564458304.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/67022340139.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/15822741553.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/27958253541.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/6242146475.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/97400485408.pdfIn PDF document text
    • http://goldsunjsc.com/upload/files/vegexawufiwevatowolog.pdfIn PDF document text
    • http://7m-shop.com/userfiles/file/28362312280.pdfIn PDF document text
    • https://r4binsh4h9-att.com/contents/files/93198077432.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/fafuragafimajamadafo.pdfIn PDF document text
    • http://kccmaul.com/files/files/xefavofud.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/fubepapof.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/famipugotur.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/guzuv.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_off0000b817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB817 16944 bytes
SHA-256: 43755a9df8e1a9beef598b5001329f3d0fca0e246981d9a0cf49675ffed678bd
font_01_sfnt_off0000e385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE385 10060 bytes
SHA-256: ef3eee17c105065e2fab3adaffb7492ec22e9b873329f54a9afcb179068389f2
font_02_sfnt_off0000f9e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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