Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eb36816e8fdad8f…

MALICIOUS

PDF

73.3 KB Created: 2020-11-19 21:53:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d66dbd4c3c6c7baed5c88c498fcd6a74 SHA-1: 1e5e39c5abf0b48bf9add71525a3e914ff4eb8a9 SHA-256: 3eb36816e8fdad8fe2248782eed55b246da007d1d1ead2682b4f7fc454e24174
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to drive traffic to malicious sites. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or redirection tool.

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/123?utm_term=atomic+structure+and+the+periodic+table+review+sheet In PDF document text
    • https://bofufawikifof.weebly.com/uploads/1/3/4/2/134235483/90e05.pdfIn PDF document text
    • https://makonajarozov.weebly.com/uploads/1/3/4/3/134341931/7110329.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/ab7f619.pdfIn PDF document text
    • https://jixatazibasuv.weebly.com/uploads/1/3/4/4/134402985/kolapotug.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/6a9a9daeda.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/17d8396a-5f5d-4f79-ad27-5720e78facee/51824842158.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/aprender_ingles_rapido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29c9bce1-4f09-47a2-aa49-fc56ec725769/kubezobijolij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d58e9a66-ca9f-49f6-8387-a0c08aa976c1/java_jdk_7_64_bit_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd4ac5c3-6f13-4bb8-80c1-a3dceff2559f/99461798437.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/sda_church_heritage.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/nylaarp_com_service_make_a_payment.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/47126736416.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/najodilugexakukirudagona.pdfIn PDF document text
    • https://s3.amazonaws.com/zobuwubedak/58315501291.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_off0000d41c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41C 5476 bytes
SHA-256: dbe191af2fcb125348ee32e66ab1baafeeb8e763960563e2ab6cc345665baf2e
font_01_sfnt_off0000e68d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68D 10208 bytes
SHA-256: 837253609ef5002e3e4792bee0c01ae60f640da8c26aa1340654b020f6f1dfc8
font_02_sfnt_off00010933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10933 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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