Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbf3a1fcda49552a…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 04:09:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 87e496ec915a0975b2f554b09ea20241 SHA-1: 2810d0b8dbe35f5141cc603ebbe4eb7ae7c3a1c8 SHA-256: cbf3a1fcda49552a19b81f8d96e8f387d5c8e1e4b9274307a07923bba711a047
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The PDF contains numerous embedded URLs, many pointing to suspicious domains, suggesting it functions as a link farm to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://vivaldiroberto.com/img/files/mediafiles/file/vomebefutunetumuwijasegi.pdf In PDF document text
    • https://qualitygums.com/userfiles/file/37766138047.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/nikowixikekamoni.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/88260179463.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/bujonalabami.pdfIn PDF document text
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/75631526029.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/2umkkamrqiq65lk0efq5hjjjnd/marevo.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/71487583028.pdfIn PDF document text
    • https://yourdentist.ro/app/webroot/files/userfiles/files/bapinolerelitujimo.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/88436888570.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/pavekijiwikupoginu.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/15124778514.pdfIn PDF document text
    • http://warmistore.com/userfiles/file/jotilijatafiwapogatume.pdfIn PDF document text
    • http://zubrcup.by/files/files/49239689130.pdfIn PDF document text
    • http://oio.cn/uploadfiles/files/wugutidikupegagodenule.pdfIn PDF document text
    • http://scpt.it/userfiles/files/kefoxekin.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/pofavulos.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/161408c70bf016---debegowewore.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/66267830977.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/38957082907.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/95833465955.pdfIn PDF document text
    • http://bubb.cn/up_file/file/nigerafamuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=this+is+us+season+5+episode+12+watch+online+freePDF 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_off0000b003.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB003 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC815 16212 bytes
SHA-256: 26036deac03cceb10adde92bf921710ed82a925ee760a38a8a787e8abc7f2b29
font_02_sfnt_off0000f110.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF110 11172 bytes
SHA-256: 2d63dd0c6dca04b090baf72e7033606e3bd4ad86248bce5867cf344bd284be55

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