Malicious PDF — malware analysis report

Static analysis result for SHA-256 c69756e200a40398…

MALICIOUS

PDF

69.2 KB Created: 2021-09-28 07:10:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 37cbb2ada1315b01b12fc2dc23ea4e8c SHA-1: d7d62fb24e21e12918d0853dd3ee0b921d7105f3 SHA-256: c69756e200a403985359d73442558ecb816cd0b2d1b582aad7d4a6b6b3afdec2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful websites. The presence of multiple external links points towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://archism.ru/uplcv?utm_term=fingerprint+app+lock PDF link annotation
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145485eb0b93---gofobokalovepag.pdfIn PDF document text
    • http://www.portaldasfreguesias.com/portugal/vianadocastelo/vianadocastelo/geraz_do_lima_sta_maria/ckeditor/ckfinder/file/mitowi.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/niwiziwogeroxameg.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/wakutofeso.pdfIn PDF document text
    • https://repare-ton-smartphone.com/userfiles/file/riforuruwosejerokolilek.pdfIn PDF document text
    • http://riverhouse.at/pcms/content/file/17496461515.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/20325559636.pdfIn PDF document text
    • http://damutech.kz/upload/2021/09files/210928032433910298tjjks.pdfIn PDF document text
    • https://charterboatdeliverance.com/uploads/files/85395703158.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/bc7023561e437c20be2d2dde3af5956e/51193077375.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/90759275317.pdfIn PDF document text
    • https://retta-bg.com/userfiles/20059651946.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202109212115584083.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/finetagawezofaw.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/50672660869.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/95307930987.pdfIn PDF document text
    • http://dga.gr/ILC/img/file/34198530573.pdfIn PDF document text
    • https://heart-calligraphy.com/uploads/files/202109240142513328.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/toded.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/26031238326.pdfIn PDF document text
    • http://litroshaber.net/resimler/files/pirugojixemigut.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/nukuzejaj.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_off0000adf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADF3 16584 bytes
SHA-256: 80d3e9226285e24aaa1dd5d70200558e55b2e23ccda49e4d6240dcbcdb0e8c9e
font_01_sfnt_off0000d833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD833 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f04a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04A 10448 bytes
SHA-256: 0ac3e9d025bca9ddaf7da06fc6f339c77d30db786bbad1900f44e428ee4ba643

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