Malicious PDF — malware analysis report

Static analysis result for SHA-256 6af0e23c687e04ec…

MALICIOUS

PDF

75.2 KB Created: 2021-01-08 09:31:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4e87a38632645fc3be42d06bb03e4f40 SHA-1: 107d2fb302267955f080a40fa66906a7f8554ad8 SHA-256: 6af0e23c687e04ecee853b7cdde0f70d7b831566168730924e3c6a1db1c03ba5
214 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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.
  • 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/aws?utm_term=bradley+cooper+oscar+2019+performance In PDF document text
    • https://limorevoxa.weebly.com/uploads/1/3/4/6/134611026/9dcb668f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380068/normal_5fbfc104b597c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501654/normal_5fcecbac7e108.pdfIn PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/8df81.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451544/normal_5fb7e7de4028c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381094/normal_5fedd67d1963c.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/9a36c347-ada9-4b6f-85ce-5eafbfc96951/dr_driving_online_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00759426-b5d7-4e51-87f9-49fc625a4d49/socratic_logic_peter_kreeft_free.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/sample_counter_offer_letter_template.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/dietitian_definition_ida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa41203f-52b8-4b0a-8521-d98f2a5b0c48/57418294822.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bcc3bd9-f3ac-4314-8858-ee1c3c835297/vowewukuzig.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/71247020722.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/lafad.pdfIn PDF document text
    • https://s3.amazonaws.com/juzowilipi/electric_current_class_10_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/301a9cd4-2561-4751-9628-e800aff7feb8/veloroju.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_off0000e7ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AC 5936 bytes
SHA-256: 2d5a00f73f1df6fa2c94ff80eaa3cad9a26826c1d409ece04936c691e7fbbf2a
font_01_sfnt_off0000fbda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDA 10504 bytes
SHA-256: a69e635b5a77f23e4e4266433ee9b1e85d7c2ac5bc8a0f727c03d65b7c5bc190