Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb88840baf8467f…

MALICIOUS

PDF

104.2 KB Created: 2021-06-09 18:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5c6b97c3f642266afd50e707915ed014 SHA-1: 04bae86c8a4e75c791ff3ed205fb9bee04daa715 SHA-256: bcb88840baf8467fc5352ccb6b202f4058061c171f84a74a7362e7496ec8c48f
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the presence of numerous external URLs points towards an attempt to redirect the user to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/123?utm_term=birmingham+city+fc+ground+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4505102/normal_60608b06106ff.pdfIn PDF document text
    • https://girezerel.weebly.com/uploads/1/3/1/0/131070389/f22d68e1f1.pdfIn PDF document text
    • https://fuzimisadu.weebly.com/uploads/1/3/5/3/135319831/jomalafo-matozugo-rataxepo-sexudesara.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365541/normal_5fce66a95e260.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446645/normal_60bea25534c68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416514/normal_605328516aa3c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450898/normal_5fc8eb7534768.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407994/normal_601b9aac971c7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454290/normal_6015293299925.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417834/normal_60458ed7bf79c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416304/normal_605044c6d7ad5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392195/normal_5ff9c3150e82e.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4449771/normal_60b149de8e21c.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/ff08603c-e18d-4daf-992d-252f4ad4218c/95149957730.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01917b3b-7d21-416c-8bc9-2ec59821c9e5/autodesk_fusion_360_-_the_master_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2178df9b-ba9e-4686-9b84-1572cb792a6d/download_film_fifty_shades_freed_full_movie_sub_indo_lk21.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69b55cbb-28ab-41b1-a10b-f20c673cb160/puwaju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/115003af-3d6d-489d-8f81-d2a56cf4bb5b/21178440682.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_off00015b17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B17 5376 bytes
SHA-256: 2ea15313273b1bc1ecfb987099ded49e593f85961b158a9647d46b8399b7b90f
font_01_sfnt_off00016d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D44 11356 bytes
SHA-256: d77c04646442b3371796cb621ff22c7a97ea56359af4f85d10faf8507ac6f8d6

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