Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11a87baa1e9d98c…

MALICIOUS

PDF

73.9 KB Created: 2021-09-12 08:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: fee6279e6590415a447e1821bedf2d0d SHA-1: 2c19bb3ebe9bfc67454ead76f3429fff98f4bfee SHA-256: f11a87baa1e9d98c2347bb336b460a7b5d896fb10cb96bd2525a456e9cd0112b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document's primary purpose is to redirect users to potentially harmful external sites.

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://infrive.ru/uplcv?utm_term=how+to+decrease+ram+usage+android PDF link annotation
    • http://kayapalinakliyat.com/file/gojapuf.pdfIn PDF document text
    • http://signauction.net/userfiles/file/14052654809.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/86429530949.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e508647cc---10236893223.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/popesorixinibenuvukuviz.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/79297514316.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/tipuxadepugojunalem.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16133e0b4d1dd7---menewigibuselajo.pdfIn PDF document text
    • http://thoitranglani.com/upload/files/90522985490.pdfIn PDF document text
    • http://srilakshmienterprises.net/uploads/vamigajajojafapipuma.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/ruvivibanerijozoxewono.pdfIn PDF document text
    • http://arucax.am/user_images/file/bovesag.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/roverijisibalididugu.pdfIn PDF document text
    • http://ersenergy.com/UserFiles/file/7349615013.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/nuzijutefuzufulo.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/dudagulawojodafit.pdfIn PDF document text
    • https://edenestates.com/ckfinder/userfiles/files/13211828618.pdfIn PDF document text
    • http://afro-safari.com/upload/files/42321564859.pdfIn PDF document text
    • http://obraz-tlt.ru/userfiles/file/4718131859.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/muritegifem.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/xexuboxebesapoligapejiput.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1612f93a6be96e---wodinadotisofufonitefoku.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_off0000be76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE76 17108 bytes
SHA-256: 842b2266befc28d513379826b2a0adb2a5f741b91b5cec1fd6f06f6899dcc614
font_01_sfnt_off0000e98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98F 10844 bytes
SHA-256: 9fac340a450a2c5ba71e1fe04e97e76030443d3b905f2f9fe1479ba284432f57
font_02_sfnt_off00010265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10265 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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