Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcde8d3aa26d7f1e…

MALICIOUS

PDF

74.4 KB Created: 2021-09-19 22:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1a160c498d1510e675fc304143b42659 SHA-1: 0e0cf8b399b3b707df29d76fca6ba2dc215e9b36 SHA-256: bcde8d3aa26d7f1ebe8bd0f3310f307787eb7559f75fbae5454b54f2dfb0bc45
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm strategy designed to obscure the true malicious intent. The presence of external URIs and the link farm heuristic suggest the document is designed to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://archism.ru/uplcv?utm_term=prince+of+persia+forgotten+sands+full+game+download PDF link annotation
    • http://magnumprint.ru/upload/files/76386354606.pdfIn PDF document text
    • https://iwistw.com/upload/files/duzuxeseravifofi.pdfIn PDF document text
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/penuxalopexobuxenadajewe.pdfIn PDF document text
    • http://ux-school.ru/files/files/butexupubazatupudamedoxim.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///68140577202.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/lakigemegege.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/pogifidigatilaxi.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/zuwakijepiwoworalab.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/radizo.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/wonopuzotasubido.pdfIn PDF document text
    • http://apcmagon.com/userfiles/serodiriwagibome.pdfIn PDF document text
    • https://hinaweb.com/upload/file/xuxofovujeb.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210920005131.pdfIn PDF document text
    • https://netcsemege.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/dixubosifuku.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/54233718466.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/55374221835.pdfIn PDF document text
    • https://afma.pt/site/upload/file/7173285241.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/luwagavi.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/87942166125.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/sunoxejamiteruvajavipez.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/161467da983a96---nevavavizemewikewiluf.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613960e771b24---23771938932.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_off0000bb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d354.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD354 18044 bytes
SHA-256: 781e73ebb12629157db894a29854d81c80a986db09d1074a62db40cdfa512c2b
font_02_sfnt_off0001021d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1021D 11152 bytes
SHA-256: 9d4286b8f4b0e1eb2b371c663651fb00a4ff13fa5e13febd758be0b20a825cf4

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