Malicious PDF — malware analysis report

Static analysis result for SHA-256 4283302a964b2cac…

MALICIOUS

PDF

88.3 KB Created: 2020-11-26 06:41:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9251f442cd922fdc72bc0f2f5b58dd53 SHA-1: 8e8b246702072782a61e9f4e222370caf552f20d SHA-256: 4283302a964b2cac4d1cca06f6b1a6a31962ec58aa0c0c16ee90674916338223
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=boot+and+glove+dryer+costco'. This indicates the document's primary purpose is to redirect users to a potentially harmful site. The ML classifier and ClamAV detection further support the malicious nature of this PDF. No scripts were extracted, and the document body was heavily obfuscated and truncated, preventing a deeper analysis of its content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=boot+and+glove+dryer+costco In PDF document text
    • https://cdn-cms.f-static.net/uploads/4494883/normal_5fb35ca6908da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414502/normal_5f9c43f310a60.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383704/normal_5fbefd127ecc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464877/normal_5fafa4151eebb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pazifetanegapu/71531410981.pdfIn PDF document text
    • https://s3.amazonaws.com/zokokamu/72180574703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d92ab92b-7b63-44d8-9d1e-faf47274a7c3/wobulani.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/tybcom_auditing_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ba37fe3-f0a6-4c05-bbb0-f1b4d4dab5ba/ot_2020_rtve.pdfIn PDF document text
    • https://s3.amazonaws.com/xefezesebusu/forcats_cheat_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2ee5122-4b29-4120-895c-d17cc574cf24/83451794772.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26eec0ec-7b85-4c4d-a7aa-d3e7e660c5e9/ripesutolibodi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9f9dd92-1e8c-48f2-98cd-7aaa4b94ba6c/bilepakof.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
    • 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_off000105e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E2 5316 bytes
SHA-256: 04a8a522bca908d2fbaffc8c244f2e036e13871656390c92f210565b8e74871a
font_01_sfnt_off00011817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11817 11464 bytes
SHA-256: fdc25f28c68f3ea204f0a0d8d13a498604c7d39b14b71e275accbde7caf8438d
font_02_sfnt_off00013f46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F46 16144 bytes
SHA-256: f0a8b786da721c7415a59d91fbce3b20bbb98ea32e48857ac1ff22d53b00ec29

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