Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe4fa601a2b7ac2c…

MALICIOUS

PDF

64.6 KB Created: 2020-12-21 23:43:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 1cd69f8fd3960820e7e2d2679037fe52 SHA-1: d3a6e18dfdd8594e22cce2b711e8ced5f451b60b SHA-256: fe4fa601a2b7ac2cc3780b3cdbbf643bd6ff3e9bfbcc6b8650425887f25d4c23
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded links are designed to lead users to malicious websites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://gettraff.ru/123?utm_term=box+heads+2play+unblocked In PDF document text
    • https://vadezuposijeru.weebly.com/uploads/1/3/4/6/134660157/84235e8fb1c.pdfIn PDF document text
    • https://jixisejilikabow.weebly.com/uploads/1/3/4/2/134265892/7330108.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446394/normal_5fb60c615ee5d.pdfIn PDF document text
    • https://tipefejiri.weebly.com/uploads/1/3/0/9/130969755/8300346.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380525/normal_5fbd3e601a2fd.pdfIn PDF document text
    • https://rasozonikazip.weebly.com/uploads/1/3/4/9/134904665/xujuderetit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426942/normal_5fd887550e474.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421472/normal_5f96f3d106b45.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/5fdc79c85e71df64d6bd9c29/t/5fdd2144e644700d7820b1cf/1608327492307/flowchart_software_for_mac_free.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/chat_app_android_studio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8740c79e-64ef-4085-97ed-fc816b5270bc/diduvudo.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_off0000c05f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05F 5620 bytes
SHA-256: 362660aac0b5ea78f84138ed99ac2b992a0af6458911243aa4c720ea4875e1aa
font_01_sfnt_off0000d389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD389 10264 bytes
SHA-256: 46ebd8813bc31b113b8e707b92a0b5e49dd270cbd7b45619ee9cd0fabf45330f

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