Malicious PDF — malware analysis report

Static analysis result for SHA-256 007b2ef7cc2eb2e9…

MALICIOUS

PDF

91.8 KB Created: 2021-09-18 07:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3b83e7f94a461caa34fae0a27a76231e SHA-1: 9040adc77aff36a99fdd67bf77a31b431b74ef55 SHA-256: 007b2ef7cc2eb2e99f6899738a5f9b0ffaf7982a050e897af4d570e1a731fedd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains embedded JavaScript and a large number of external URIs, many hosted on potentially disposable domains, suggesting a link farm or phishing lure. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://rexant.by/upload/editor/files/20347979735.pdf In PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c029b4f7ec---65241736630.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5e9788ade---wipazulipar.pdfIn PDF document text
    • http://spartaksedlec.cz/spartaksedlec/userfiles/file/48802060341.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/61640962623.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1631929104.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/fafakokokagalewopevize.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/jibezufinileponadukeg.pdfIn PDF document text
    • http://mtkshop.com/images/uploads/file/12694964819.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/5029073944.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/84671718007.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/1751558329.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/49772816865.pdfIn PDF document text
    • http://hasomedia.com/userfiles/file/gokevowimikabukujuvatudo.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/99351515494.pdfIn PDF document text
    • https://pindimana.in/uploads/file/90432676206.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/labupusajuxetutozax.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/34875493017.pdfIn PDF document text
    • http://tries.cz/media/images/upload/file/90964098432.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210912235219.pdfIn PDF document text
    • http://tucsokszekszard.hu/images/news/file/58028238533.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/vawot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=personality+words+starting+with+nPDF 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_off0001013e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013E 18932 bytes
SHA-256: 5eb35516b9e243740e84aebb17646dbfa9edb3caeb9ab96442f5f2d77623fd4d
font_01_sfnt_off000130f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001490a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1490A 10728 bytes
SHA-256: 04fba1f3cdb72e06d0d2bf602ee139b2885d2b03a1620e59faf2797f05da6269

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