Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfb9d817141b363b…

MALICIOUS

PDF

66.3 KB Created: 2020-12-18 00:24:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: fb631e7a9372db203fc3df4f11bb109e SHA-1: 579292ed3a31f6c44153e33ee853bc565cd2b1d2 SHA-256: bfb9d817141b363bc735aa4b0de8a6dcab61987c16fe81726458605b1b47e68e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://traffine.ru/strik?utm_term=warm+fuzzies+cold+pricklies+book'. ML classification and ClamAV also flagged this file as malicious. The embedded URL is the primary indicator of malicious intent, likely serving as a lure for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://traffine.ru/strik?utm_term=warm+fuzzies+cold+pricklies+book In PDF document text
    • https://cdn-cms.f-static.net/uploads/4379611/normal_5f9584556cfb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481509/normal_5fbb0a7a6b1ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385427/normal_5f9104de459dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481158/normal_5fbbd9c77c504.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5f9779b530ac1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459326/normal_5fbc09d50c277.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6511ecc-06ec-4567-9932-44447e4b0479/80724540915.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53dd38dd-a9ed-407c-9b5b-01444f238f93/jamestown_middle_school_yearbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91b6d8e2-5577-4e4f-b16d-ae1adf4eaedc/calories_in_3_oz_grilled_pork_chop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4d67590-a35a-486f-97de-f9db7687efbc/49923256208.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC893 5568 bytes
SHA-256: 8516f17f704ba9ec6d1b5971b879627557d21581ed7ed72a43b766bb99015a1a
font_01_sfnt_off0000db81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB81 9640 bytes
SHA-256: 85bae3f3cfcfa052ef2ef23078d6aa4a1e3d7937782d8f65633875da02791849