Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f61f4707baa6adb…

MALICIOUS

PDF

82.8 KB Created: 2021-05-24 21:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b36e6d4e881d5e1accd4f894f1e9945 SHA-1: aff2e72affd78745941e5265b55eba8929301b7a SHA-256: 0f61f4707baa6adbe3e140d89220ee1a3587025882e135ef4ee295ce3ee61e16
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML score. It contains a large number of external links, many pointing to potentially malicious domains, suggesting a link farm or phishing attempt. The embedded URLs and the PDF structure indicate an attempt to redirect users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/strik?utm_term=barron%2527s+sat+subject+test+chemistry+15th+edition+pdf
    • https://kenufipafalenar.weebly.com/uploads/1/3/4/6/134616414/602127c7a.pdf
    • https://static.s123-cdn-static.com/uploads/4492918/normal_5fe29454b67d8.pdf
    • https://dojufewuwi.weebly.com/uploads/1/3/4/2/134235401/wedogobadukatore.pdf
    • https://satomasutal.weebly.com/uploads/1/3/2/6/132681949/1968259.pdf
    • https://cdn-cms.f-static.net/uploads/4393900/normal_6050fc280a814.pdf
    • https://cdn-cms.f-static.net/uploads/4418170/normal_601bfa7b2385c.pdf
    • https://cdn-cms.f-static.net/uploads/4413240/normal_6055907ccc41d.pdf
    • https://wijirejilape.weebly.com/uploads/1/3/2/8/132816202/burukixulapalil.pdf
    • https://diwirutug.weebly.com/uploads/1/3/4/3/134387727/30c6934d4.pdf
    • https://cdn-cms.f-static.net/uploads/4405641/normal_601ae1ddc0c5c.pdf
    • https://cdn-cms.f-static.net/uploads/4419193/normal_605305a729ae2.pdf
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/wigobusita.pdf
    • https://xajijalati.weebly.com/uploads/1/3/3/9/133997138/9616876.pdf
    • https://cdn-cms.f-static.net/uploads/4425915/normal_601b26c1400ba.pdf
    • https://static.s123-cdn-static.com/uploads/4466143/normal_600352ffae8cd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/368e4acd-6a8a-4882-8a63-2e214c8ff6a3/ejemplos_de_guiones_de_teatro_cortos_para_jovenes.pdf
    • https://uploads.strikinglycdn.com/files/df56de8b-d7ed-4cc6-97c3-5ca18e67995a/beechcraft_king_air_350_operating_manual.pdf
    • https://uploads.strikinglycdn.com/files/7bb86633-7c06-4360-9cc5-813663e609c1/ms_excel_assignments_for_students.pdf
    • https://uploads.strikinglycdn.com/files/6dd0ee39-d402-481e-b562-b3d8e32fcd4b/chilton_repair_manual_book.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb9c.bin
a94cee2ab2aac32ea110d2c4b9b54e29abdbd87be9f45bb7b2ae59e38c4c8059		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 5940 bytes
font_01_sfnt_off0000ffc5.bin
6d38fcc7f84c759613e2e61898a09fab16ab0f297c9c39f667b1413240574f90		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC5 13024 bytes
font_02_sfnt_off00012813.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12813 16204 bytes

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