Malicious PDF — malware analysis report

Static analysis result for SHA-256 5196cf197b977883…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 08:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c1c9768ab244a8d26d0535fd43a15e77 SHA-1: e27f45026850bf054c71e178bafaab796e61deac SHA-256: 5196cf197b9778839a95a484302c28dae0a28dea0d9049ace065b8c087a563f6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features numerous external URIs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://eniedu.com/data/file/20210917012510.pdf In PDF document text
    • http://kayapalinakliyat.net/file/99505859585.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/71603933759.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/mefezevapaxogetazo.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/41592695128.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/rupiwimovedubafabafu.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/likobiwizefevenimotatumag.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/negumop.pdfIn PDF document text
    • http://salespate.com/userfiles/file/36558017448.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/ruxexikokutezipubigevi.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/61848050500.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/2040098797.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/diludodudap.pdfIn PDF document text
    • http://dooroc.com/tk/upload/file/41496408069.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/ximinomusew.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/zixekumebufepagarimuzi.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e13c5d4e9---71908859469.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/79628117005.pdfIn PDF document text
    • https://ms2oke.com/contents/files/pexedowefemifamoru.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143558a8049b---31248116479.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/vatixupewubedikilazirof.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/38186103809.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/6344508920.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=android+check+app+data+usagePDF 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_off0000d4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EB 18188 bytes
SHA-256: 03e385a0f274fbddf2e27e81b19baf276f8ee5b28b24c9be579f4f798176a88e
font_01_sfnt_off00010425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3C 10920 bytes
SHA-256: 90ebd59309ba6aa0aca4615668e74adc2c86d537c503a2b1924ca9c110829f30

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