Malicious PDF — malware analysis report

Static analysis result for SHA-256 d108a1ffe6279c80…

MALICIOUS

PDF

79.9 KB Created: 2021-09-10 00:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0b144ed170135d51b20ca031355362c0 SHA-1: e713530895076076f1c7e6b51defbfc10f317693 SHA-256: d108a1ffe6279c80c2ec9aaf9d662605efd625dd6955cfdc3645737abf42c436
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 various domains, many of which are structured as link farms with UTM parameters, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://coretry.ru/uplcv?utm_term=set+ringtone+on+android+phone PDF link annotation
    • http://fge-service.com/userfiles/file/87826231358.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/toguwupovexabawesoduje.pdfIn PDF document text
    • http://klhl.com/userfiles/file/tojekodikadubiserebewi.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/97551888898.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356a074f567---40898275180.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/ratimebosolaxak.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/xepidutadu.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/falewopijukunogokarovijal.pdfIn PDF document text
    • http://bhavalaya.org/ckfinder/userfiles/files/12180643487.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/12464783305.pdfIn PDF document text
    • https://sadex.pl/fck/file/losowojataxem.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/23549114137.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210907/1043454432.pdfIn PDF document text
    • http://balone.net/_upload/file///88778738024.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/36907005291.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/64840234344.pdfIn PDF document text
    • http://csc-0898.com/userfiles/file/20210909222738_8epwt8.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/jogewagusov.pdfIn PDF document text
    • http://seednseed.com/admin/fckfiles/file/bejigibafikatesi.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/50348264129.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161362d037f3d3---lopesaxemenalaz.pdfIn PDF document text
    • http://zabbeleecooking.com/ckfinder/userfiles/files/59570204475.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/jodiwaveboxuronabevosipob.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/2163654153.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_off0000d492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD492 17748 bytes
SHA-256: e7bcb1bd4933a62505ad05e3765cd46ef0e6f3845e160c7d6da8e227c204eccf
font_01_sfnt_off00010266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10266 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7D 10532 bytes
SHA-256: 765918789817201c63be63cb2476b84fa2ed36a66bdd139aefd5024f424a7545