Malicious PDF — malware analysis report

Static analysis result for SHA-256 262d85846cf942a2…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 23:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 06b863db7a4c2e89b4423e27d43bc1a4 SHA-1: d67d0c798d1f5d49aed7e502beb3e03d6bf42184 SHA-256: 262d85846cf942a2e5e7e875406d3448bffef906ceaf6129cae9274966bbdad6
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting sites, a common tactic for distributing malware. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to decrypt a password-protected archive, a method to bypass gateway security. Embedded JavaScript was also detected, suggesting potential for further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://aburobocon2019.mnb.mn/uploads/files/kababibof.pdf In PDF document text
    • http://docando.es/js/ckfinder/userfiles/files/3812899980.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614330c5b05fd---8629465161.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/mejepegojuvatabuletidekax.pdfIn PDF document text
    • http://winso.tw/userfiles/file/xaxub.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/gesoxotaneb.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138a5c39bae9---28159582521.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/29344953493.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210914_1E72A192E93F057B.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/xuxekodiseduvuxaxiji.pdfIn PDF document text
    • https://tmtteks.com/files/karimixip.pdfIn PDF document text
    • http://www2.grupoksl.com.br/js/ckfinder/userfiles/files/geratokasuvowolak.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/11501371081.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/defigukazogusalatijadebem.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/58595078993.pdfIn PDF document text
    • http://arucax.am/user_images/file/loraxesunetisusof.pdfIn PDF document text
    • http://clickvay.com/upload/files/xavewasi.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/ninadakufipudufutogedubeb.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/77632417941.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///85480459474.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145665fa8a3c---lepiridabirevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=psp+wwe+2k21PDF 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_off0000d9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C5 9876 bytes
SHA-256: 03f67b36d4e956cc66e6a5d83da475e636be6b702e83800d5cbfa0c2191eaaf5
font_01_sfnt_off0000efcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCF 18560 bytes
SHA-256: 310396c8df64ebf7b0a22763439bb45bfc72933843108c7901268230371b0925
font_02_sfnt_off000120a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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