Malicious PDF — malware analysis report

Static analysis result for SHA-256 82e5ca065ab7c0ca…

MALICIOUS

PDF

70.2 KB Created: 2020-11-10 20:41:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 20912065faca9ff1604aa5f14a0a83fc SHA-1: bf9947b355f18e40c36418ef2764eb64df5d93c8 SHA-256: 82e5ca065ab7c0ca759d0a0a83f0a71012d970a447745669f28547e2273f4265
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, identified as a link farm, with one pointing to a known malicious redirector. The ML classifier and ClamAV also flagged this PDF as malicious, indicating a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the nature of the link farm suggests it's designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?keyword=rustburg+middle+school+images In PDF document text
    • https://jatorogerujew.weebly.com/uploads/1/3/2/7/132710569/8c3f11ed.pdfIn PDF document text
    • https://polabufasol.weebly.com/uploads/1/3/2/8/132814050/nuvefitu_gopuxu_zekanew_bezix.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://s3.amazonaws.com/bagisi/nafurokiwumu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/301ae37c-083b-413d-838c-d135ce34032e/sataledowu.pdfIn PDF document text
    • https://s3.amazonaws.com/tofizo/14702000038.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5fbddd2-40e3-4843-a7ed-441ece7b43ac/ti_84_calculator_download_for_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63ba9f27-fda6-4d54-bb6a-1ab225db3507/36983795095.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/assessment_center_ejemplos.pdfIn PDF document text
    • https://s3.amazonaws.com/zowejunef/baxamowemazutum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d95bde19-5dbd-40a1-aa06-ce38b9ba1232/download_frozen_mp4.pdfIn PDF document text
    • https://s3.amazonaws.com/fujadabez/ruvokofesigiwe.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_off0000ca72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA72 5276 bytes
SHA-256: aac0e69e6203a406b56722bfbc8b3e90138c9f602d5cfca2b1fbb434459a96fc
font_01_sfnt_off0000dc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC53 9904 bytes
SHA-256: 3aeb5f02f6edf8b475bb88a48fc16be4b4c106cb24943daa3080ff602c01d13d
font_02_sfnt_off0000fde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE4 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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