Malicious PDF — malware analysis report

Static analysis result for SHA-256 104f0069e8405d72…

MALICIOUS

PDF

92.3 KB Created: 2020-12-16 01:18:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 54061064ee76e3df4f94fcee273e3e6e SHA-1: b484a6b83bacd6b36b777133e779696879e0175d SHA-256: 104f0069e8405d72061a2dd5c117a471a8e9f08bbdac204b5d7f6bcb3129b8d0
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files on Weebly and other platforms, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://trafffe.ru/123?utm_term=professional+counseling+organizations+in+texas PDF link annotation
    • https://basedupapopulow.weebly.com/uploads/1/3/4/3/134344364/sebakij_wajos_pumani.pdfIn PDF document text
    • https://pamaridefudeluz.weebly.com/uploads/1/3/0/7/130776324/tomagujaxi.pdfIn PDF document text
    • https://sujibovuf.weebly.com/uploads/1/3/4/7/134705076/9547428.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375075/normal_5f9056c119cdd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454301/normal_5fa76b02729fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465539/normal_5fa6a7e35429e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410027/normal_5fab7e6ac0847.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410414/normal_5fa8ce272c11b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366642/normal_5f908ba67f2ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457838/normal_5fd6685b8f6b0.pdfIn PDF document text
    • https://zanasebumafuwaj.weebly.com/uploads/1/3/4/8/134899829/7890916.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbfdc47a13a450babee0d2c/t/5fc1a09608845d0924c7f4d4/1606525079516/map_of_csulb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e916f52f-47c2-4991-bb0d-f9c1382cf782/2020_army_pay_chart_dfas_active_duty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/399ddedb-7675-4ce6-b8f4-085158aa20e1/les_pronoms_cod_coi.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_off00012969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12969 5168 bytes
SHA-256: 2f4a0efaf58c0a959b3b663c8b38c9cd4494f4bef2b865eeb21189197134618c
font_01_sfnt_off00013b1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1D 12004 bytes
SHA-256: 0c27ad4f800c0467975766484819ebdef406332e07f57577fb9acdff45f61215

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