Malicious PDF — malware analysis report

Static analysis result for SHA-256 b330ee3673c812dd…

MALICIOUS

PDF

86.3 KB Created: 2021-10-06 03:59:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: dde339145d1f5d2e72dd735c8bc05d4f SHA-1: 8750e9dc1ac0efea2dd3cff49714ab1d676ac98e SHA-256: b330ee3673c812dd341813854cec3a06fcf6ca49df141d4f14fa007257ccb365
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous external URIs pointing to various domains, suggesting a link farm or redirection mechanism. The PDF's structure and the presence of embedded URLs indicate an attempt to direct the user to malicious external content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://krisoc.ru/uplcv?utm_term=springtails+in+window+sill PDF link annotation
    • http://vigova.com/Images_upload/files/gozitupusatuw.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/13469021411.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/pugupuli.pdfIn PDF document text
    • http://minhquoc.vn/uploads/userfiles/file/27171616669.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/botofolijudexugobez.pdfIn PDF document text
    • http://webinaris.blog/ckfinder/userfiles/publics/files/tebirebusavizuj.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16152360cc7c6e---jiwiposunarupifov.pdfIn PDF document text
    • https://ises.smithpressautomation.com/phpsites/vertical_living/uploads/file/tixoretonizajobetinokaz.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/xekifilupavorofuxif.pdfIn PDF document text
    • http://ndemal.com/publish/page/file/70163536668.pdfIn PDF document text
    • http://honyi.tw/ckfinder/userfiles/file/98024018120.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/pubaxefa.pdfIn PDF document text
    • http://myphamnanyno.com/luutru/files/13598728284.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/sewotidibibebikevumu.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/78089177726.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/rixevitefuvogiza.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/73109570538.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/31040991875.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a8b5bdf8a378918fbf3573f02623266/75818618974.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/75967522284.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/nisigegilikebodifuxamusaj.pdfIn PDF document text
    • http://avvocatoandreabruschi.it/userfiles/files/poxavapasanatusama.pdfIn PDF document text
    • https://resortweeks.pro/userfiles/file/mifetavepidum.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_off0000ed40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10552 17832 bytes
SHA-256: 6dbf934f6f62947ce574e77bd1978eeb90d71f95d39e768658f0e0076e3b76ef
font_02_sfnt_off000133b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133B6 10596 bytes
SHA-256: 65130e27d18e57f4b684755f58fe3130dcac26276ca452e0d76f05152051e1b9

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