Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5aaa64651ef8c6f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 13:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 8cd2e4fe7b56681e569db9afc7245b31 SHA-1: e2c75f48dba7564073edb64eea2d178347ba2284 SHA-256: b5aaa64651ef8c6f54819966196edc71f52fc7e467c8c6934f8e147dfe164197
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=applied+logistic+regression+3rd+edition+pdf PDF link annotation
    • http://cpviettin.com/upload/files/wedesizimekikifizepusaru.pdfIn PDF document text
    • http://haai.org/upload/file/xulusagux.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/kidevidipazur.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/53487329794.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210908111607.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d32847313---15830544166.pdfIn PDF document text
    • http://foxhill101.com/userimages/jesiwalifuvasewawemale.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/vipewegadikokixo.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/potomodul.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/86680261020.pdfIn PDF document text
    • https://hotlinepro.in/admin/userfiles/file/69211488959.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///vopozukupebibotu.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/84554634880.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/13c2550a2776ff1e000f3b017d7af048/lodofimaki.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/27772705487.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/danubumimibalejusoz.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/32541451506.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/86853612806.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/58938830569.pdfIn PDF document text
    • http://giaphatmed.com/upload/file/233339301.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/49238066840.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_off0000dc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC94 18132 bytes
SHA-256: eeff535b020593178ad98baf1752de71a816e888e3cebde6a9e664de6cbc2146
font_01_sfnt_off00010bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD3 10784 bytes
SHA-256: a99d58bbcc9e53b7a5d58d945ae21a380bc8fabc511a3cf39a40fa0a8f16cd45
font_02_sfnt_off0001249a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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