Malicious PDF — malware analysis report

Static analysis result for SHA-256 586db310bcfa9fad…

MALICIOUS

PDF

92.3 KB Created: 2021-09-10 23:22:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ab9f500f2bceba719406395b021a6621 SHA-1: aa0621a9190942784c9d899fc3270796c9208c58 SHA-256: 586db310bcfa9fadc10576fa796afaf5ed8a419e80a99ad6c0eee2565090aef5
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to disposable domains, characteristic of a link farm used for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://garglob.ru/uplcv?utm_term=final+fantasy+advance PDF link annotation
    • http://futureinfashion.com/ckfinder/userfiles/files/mirol.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/jogiworoz.pdfIn PDF document text
    • http://grupophi.es/uploads/files/31055671476.pdfIn PDF document text
    • http://parmalab.it/userfiles/files/pakoduronokisapelilar.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/92156095938.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/mazasaki.pdfIn PDF document text
    • http://ulleungroadtour.com/FileData/ckfinder/files/20210901_E57042B9B13C004B.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/sugumuwiberivik.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/gajiwawenilimaxuto.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/tivinofune.pdfIn PDF document text
    • https://airin.lv/images/userfiles/file/42342440461.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/49683787197.pdfIn PDF document text
    • https://doctorchina168.com/upload/files/kulaxofuvidu.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/65829479086.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/dujegukuj.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/82169445754.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/99899317305.pdfIn PDF document text
    • https://nk-sostanj.si/files/file/diwelewajibomew.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/kofera.pdfIn PDF document text
    • http://sumisaedu.com/FileData/ckfinder/files/20210904_B9B7143C613F0F0E.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383cd66cffc---sudafini.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/29cd4bfd08a9ac67a8db42b422ccaf69/pepelitakubedet.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/65370240102.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/golomikudijemob.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_off0000fdd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EB 21072 bytes
SHA-256: 00ca5819643ecffd8960ca759f30191c19bd75a3e983514b33c2412d65aa678f
font_02_sfnt_off00014c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C10 10404 bytes
SHA-256: 4269460ffa176f93fc14a872309b8846bd935042b1e2d9e58dbd7ee97079e198

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