Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6fcd2c5cfa0fb68…

MALICIOUS

PDF

74.2 KB Created: 2021-09-20 14:03:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ac82a2faca81774716463aa010394234 SHA-1: 7e6971c882c59ad6ef94d1a6e2853eb92ffa39a1 SHA-256: b6fcd2c5cfa0fb6866da7bcf16c063df575ef8ffccf317c77b179ead8f6ee2b8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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=www+animals+video PDF link annotation
    • http://gzafjc.com/uploadfile/files/xarawedumikiw.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/dokerinevowurawikomi.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/fifobutonup.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb8082fe85---pedalegeb.pdfIn PDF document text
    • http://movediary.com/userfiles/file/gifatubewefitimaw.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/15781010241.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/691469247.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/74833092115.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/43276101822.pdfIn PDF document text
    • http://fields-on-earth.com/images/blog/file/lazasomega.pdfIn PDF document text
    • https://haidangpc.com/contents/files/76678293355.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131869bccba1---25078472018.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/16951378008.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/77651962201.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/89955059485.pdfIn PDF document text
    • http://placidlakes.com/larpm/uploads/file/53957061141.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/73254126872.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_off0000bf81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD793 17452 bytes
SHA-256: 3b096e5823c84b64bf33fd66ebdfe2c57c18a87145e3b9a43961768f962acdb0
font_02_sfnt_off000104f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F2 10356 bytes
SHA-256: aa859dd733a8e359adfb579b9e1a2e9a948b9e113cb0ef30a167030f66267a89

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