Malicious PDF — malware analysis report

Static analysis result for SHA-256 863c07c4ebb5837b…

MALICIOUS

PDF

62.2 KB Created: 2020-11-18 22:14:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: bed498e32f7b5805fa578877bb53be13 SHA-1: d704a9cd00b5e8a4e82b592cf0e7299298b5a7a2 SHA-256: 863c07c4ebb5837b38dc49f14ca910ca8555dc8283415478bd57cee9867b0fca
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, pointing to various PDF files. The ClamAV detection and ML classifier strongly indicate maliciousness, with the primary URL suggesting a phishing or content-luring attempt. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of techniques used to redirect users to malicious sites, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafficel.ru/strik?utm_term=present+past+and+future+simple+passive+exercises+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365660/normal_5f8703f9406da.pdfIn PDF document text
    • https://xixemoxutosiseg.weebly.com/uploads/1/3/4/4/134473276/377169401b9e.pdfIn PDF document text
    • https://dusexitope.weebly.com/uploads/1/3/4/6/134646398/960b96b0e.pdfIn PDF document text
    • https://denepuwukofakar.weebly.com/uploads/1/3/4/3/134316944/5ea46.pdfIn PDF document text
    • https://begaraga.weebly.com/uploads/1/3/4/6/134652864/79ac1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408462/normal_5fab648820fa6.pdfIn PDF document text
    • https://gagumosesixibo.weebly.com/uploads/1/3/4/0/134018544/cb5f4d4e2.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/92992023-016b-4d6c-a440-474cd64d9121/48965074395.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f1939db-171f-4a14-b492-7d1c64b2c11d/53809010224.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a402328-624b-4cd5-93e8-6a96ce99241a/24760632530.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2153302a-1fb6-4349-9e35-9b777528a338/xugigiko.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e75cd76-26da-4022-8793-d8e60a7645c9/tafuzinipamaxewixiralabek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cc359fc-df40-4c4f-9fab-02a72567d2f7/diputaniga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/290eaf9a-9280-4fbf-88e7-f7cdbce7d126/63529469562.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_off0000b5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5A5 5428 bytes
SHA-256: 432c7da38c111c9afbf4d3b08d528ddc1850fbaa030db5ef182a5cd6e9a3d2e9
font_01_sfnt_off0000c817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC817 10384 bytes
SHA-256: debfdaeabc8d060ccb94b91e0002e6ac6e9925bfc6701efcdfb047754070078c

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