Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6887a3227835492…

MALICIOUS

PDF

67.4 KB Created: 2020-11-22 00:53:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1cac8319fe5f091a1845dd03005b372d SHA-1: 74ac6ffde9cf0f44750daffb71058795b46e1aaa SHA-256: c6887a322783549203c053e24bae461c7125b5105902784f227fa3d10e47f5a3
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as malicious, including a redirector link and a link farm. The embedded links, such as 'https://gettraff.ru/123?utm_term=corporation+inc+unblocked+at+school', suggest an attempt to lure users to malicious sites. The presence of numerous links, many pointing to disposable hosting, indicates a strategy to distribute malware or conduct phishing attacks.

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=corporation+inc+unblocked+at+school In PDF document text
    • https://rojomitalo.weebly.com/uploads/1/3/4/4/134485393/56831.pdfIn PDF document text
    • https://kunobile.weebly.com/uploads/1/3/4/5/134517695/muginujukekos.pdfIn PDF document text
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/3324948.pdfIn PDF document text
    • https://xadudimomo.weebly.com/uploads/1/3/4/1/134131791/dedojej.pdfIn PDF document text
    • https://xexezakofiwojuv.weebly.com/uploads/1/3/4/3/134372147/d9b722.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369922/normal_5fae137ee0e07.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/d8165375-a055-467d-b2d6-38339d3f4743/social_research_methods_bryman_5th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/977ebadd-429d-4952-8f02-f32907dd57b0/wugowumajomegufadipupiti.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd2d29dc-56c3-4d37-b027-bc4850f0e938/31794399047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a2ee018-97c1-4907-a7de-d2de387d89d5/68369136216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c8f699e-d8fa-45e0-86ef-28a1fa020ff5/xojaguwibilewaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5db9f41-ec01-43a1-bd53-f35e570ad4d8/zisozotizutolubasufajib.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/dapexirovebomem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe82738d-bf86-4d06-a9f7-75aab6f3b978/invisible_man_study_guide_teachers_copy.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/autodesk_fusion_360_ultimate.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_off0000bebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEBE 5268 bytes
SHA-256: af351da8dc94f0f59e743f20a8e3338c1a915993be29511dcd4ebd415f16bc2f
font_01_sfnt_off0000d088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD088 10032 bytes
SHA-256: f0b3a56a8d1d0038004087c51a5454174316bba4f4c4c4d025cc805861c3cc69
font_02_sfnt_off0000f288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e