Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eba848a893147df…

MALICIOUS

PDF

81.0 KB Created: 2021-09-17 20:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 88268d817284e56369854c75ea6cb023 SHA-1: 671e7aa04a73e2a202189798bb371e3121c83bf9 SHA-256: 9eba848a893147dfb47f160b84aa2cbdd05c28c5e04aa666440ade4ac0def42f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to various domains, many of which appear to be link farms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the sheer volume of suspicious URLs suggests a coordinated effort to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://nomylo.ru/uplcv?utm_term=pokemon+soul+silver+apk+download PDF link annotation
    • https://fajndoktor.cz/images/file/files/17939519638.pdfIn PDF document text
    • http://skisun.it/userfiles/files/14003869687.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/mewulamekesaxuxu.pdfIn PDF document text
    • https://angem.fr/userfiles/file/81682640754.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/ladeginirumuzigur.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/sefarurumedawafigofureze.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/76746538007.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/gubawinukinajixixu.pdfIn PDF document text
    • http://lejuriste.ru/files/file/dodebawetixe.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/varemipiberizexobaxemalu.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/2742ff7286eba1c67825bb7fd3e96406/sorofutuxu.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/98895083369.pdfIn PDF document text
    • https://unaizahic.com/Files/files/33483174342.pdfIn PDF document text
    • http://cocoabuterol.com/upload/files/51936860674.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/nizigazopasidoxam.pdfIn PDF document text
    • https://yourownadviser.com/ckfinder/userfiles/files/gekiponotejokexegilixojub.pdfIn PDF document text
    • https://nikolsbeauty.com/webroot/f/uploads/file/wuminegigazoziketigi.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/62389973787.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/tibek.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/56576156627.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/dobakikenoletutuseki.pdfIn PDF document text
    • http://potlista.com/file/files/17789811687.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/gubutepepuj.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/rejanirekono.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/fadob.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_off0000d700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD700 17908 bytes
SHA-256: c868a049cba301f9c7159a1a6daea72f4beddab8e4ac69a4dfc4af05623da0e3
font_01_sfnt_off00010563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10563 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D7A 10800 bytes
SHA-256: b01ece2326c373534fb9a4b250e80bb971f0e3dd1d4d4632e4e2cda7ac4f7642

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