Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f8b35df85c16185…

MALICIOUS

PDF

66.1 KB Created: 2020-11-22 10:05:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 5aa8cf35d86281d7a5215e7c12e9bcc2 SHA-1: 1f2a7002c5bf797e67335ed2a415d54d010bdf37 SHA-256: 8f8b35df85c16185997fd5e72eb40ab7cf652f9cf17f6d0216949152c84fed69
154 Risk Score

Malware Insights

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

The file is a PDF document flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The embedded URL leads to a known malicious domain, suggesting a phishing or redirection attempt to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/123?utm_term=act+workkeys+scores In PDF document text
    • https://duxujofibedusor.weebly.com/uploads/1/3/4/5/134577283/zevuminunoloxan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408706/normal_5f9958b6662e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425224/normal_5fad2f8da092f.pdfIn PDF document text
    • https://vobudofokivelux.weebly.com/uploads/1/3/4/5/134599261/1760185.pdfIn PDF document text
    • https://nanorobudilason.weebly.com/uploads/1/3/0/7/130775181/6871058.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424632/normal_5fa6d7ab174f3.pdfIn PDF document text
    • https://foretenam.weebly.com/uploads/1/3/4/7/134700633/xozalivodotute-sopekudo-vilotoviwijepaz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/52cac94e-a017-42be-a01b-56db15852cfc/97194096125.pdfIn PDF document text
    • https://s3.amazonaws.com/rotafasaniz/word_that_starts_with_z_and_end_with_z.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e754b2f-ef70-4b5a-a62d-4b5f5a14a7b4/34866298809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/063f7c18-67bf-415e-bb18-3e68ef381edb/41304519146.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/appetizer_adalah.pdfIn PDF document text
    • https://s3.amazonaws.com/pewibim/fubonopuvuwimefenafoduz.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D7 4432 bytes
SHA-256: a5fe17b1e8ad34340a57198ce93eac3273721fb7daa9ea05b2f847e5eaab2cbf
font_01_sfnt_off0000c90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC90B 10292 bytes
SHA-256: 06233ca3f9aba6258787eef933479df49ee45729fee210199c4ec65cad1463ba
font_02_sfnt_off0000ec49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC49 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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