Malicious PDF — malware analysis report

Static analysis result for SHA-256 b634b21e27cd82b7…

MALICIOUS

PDF

73.9 KB Created: 2021-09-11 22:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6c86b4b4fed455075a2351afcacc4370 SHA-1: 91e4387b62c06a620ac1f87df4f2dd25219324c7 SHA-256: b634b21e27cd82b75ad3e32c433aecfae021b4723e0eea55c5278c07ac01084c
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It functions as a link farm with numerous embedded URLs pointing to various domains, many of which are unknown or potentially disposable. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://tvsporedi.si/vsebina/46533360547.pdf In PDF document text
    • http://tlw.ro/UserFiles/file/tumixajemoruk.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/zugujepulijozilidomi.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/25608425290.pdfIn PDF document text
    • https://giaphutelecom.com/tctt/sites/aaa/file/lajobajamuxeg.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613980619bf56---24842705218.pdfIn PDF document text
    • http://www.sport-konyv.hu/userfiles/file/45809524313.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/muwomibusopexalomutar.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/d77ae5f483e764bd3b96e5d0ccbab265/rebawuvekulozizak.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/40039072616.pdfIn PDF document text
    • https://securitydm.com/slicice/file/bemejurobuzojefuwu.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/46058350655.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/kajiwivupas.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/viwuxetaz.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/wejasani.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/58448049007.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/zibuzejuladoxufagadukefi.pdfIn PDF document text
    • https://ratoempat.com/contents/files/tabifoziloluzelaxax.pdfIn PDF document text
    • http://aven.su/userfiles/file/jasuv.pdfIn PDF document text
    • http://dejede.com/userfiles/file/xiborifovukedofiw.pdfIn PDF document text
    • http://bilateralmatters.org/userfiles/file/luvakil.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/40646962705.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/vuxosotafimotogopa.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/dusozelizidole.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/14207375431.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=best+free+games+for+note+20+ultraPDF link annotation
    • 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_off0000bc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC51 10860 bytes
SHA-256: 7eff21931528fe63ad5eff273637e452b0a6f720a5941d0d6a3e3f27c2dd73d7
font_01_sfnt_off0000d58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD58A 17280 bytes
SHA-256: 302df215294eab9a462d5983cfd50a2f1e79d173c212dd162f145ee80aadad1a
font_02_sfnt_off00010218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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