Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f9bee72c8e7a63c…

MALICIOUS

PDF

99.0 KB Created: 2020-11-29 03:31:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 492c63d55ed630a58c650130281250dd SHA-1: 1f01d0a4f4db09f0b622c86fb4e7d4d9964ea796 SHA-256: 0f9bee72c8e7a63c68ef555c71a9b60c63e78a0b0c3467c12aefe9a5de8aff2b
214 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for downloading an 'apk'. The presence of multiple external PDF links suggests a link farm or redirection strategy. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://cctraff.ru/123?utm_term=last+day+on+earth+apk In PDF document text
    • https://cdn-cms.f-static.net/uploads/4380403/normal_5f93a938b8d52.pdfIn PDF document text
    • https://sususijofazitut.weebly.com/uploads/1/3/4/4/134462406/pujosamobobikip_keminakemanuz_vafesapazidavil_nabewog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420237/normal_5fbdff1dade82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380403/normal_5f8bead53b749.pdfIn PDF document text
    • https://fagisidide.weebly.com/uploads/1/3/2/6/132682833/1247824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449793/normal_5fbd1cc05885f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392218/normal_5fa617949fb7b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/biwubeleba/85991210164.pdfIn PDF document text
    • https://s3.amazonaws.com/wemupajese/rowegudugakixumevububuxar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebad35fb-2a90-4970-b843-a260ff180556/mesijodajumoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da0e9ed1-da09-4602-ad8d-d8fda4ef5366/91159333655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b68ac222-f5b2-40b9-8948-5b45e93f6464/avengers_endgame_on_netflix_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6099c7a5-ef3b-4eaa-841d-c0ec2fd61c3b/noginepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f931334-df83-4e17-810a-699cafd6d926/riromejiso.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_off00014234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14234 5124 bytes
SHA-256: 9e2de0da49577693345ccb17d06322efd383cd6ff96f68bf006f2bb0cbb24311
font_01_sfnt_off000153a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153A5 14296 bytes
SHA-256: f7c5878628fb4c6db7c18d12d5e18611c45b8a4acf4b09f85239e12f6d201b68

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