Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c2435496470d7c2…

MALICIOUS

PDF

66.2 KB Created: 2020-12-18 21:10:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 08932f6a3b67792c1279dcccd33917d6 SHA-1: 1d333f2abe78342366a3a9d4eccd6e8a9fcc35d7 SHA-256: 6c2435496470d7c2fbab294e234c413cf0c29d6092bcefd6cb8fb64771478aab
156 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 external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. One of the primary external URIs points to 'trafffe.ru', which is suspicious. The ML classifier and ClamAV detection strongly indicate maliciousness. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of malicious intent, likely to redirect users to malicious sites.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafffe.ru/strik?utm_term=savanna+biome+minecraft+seed+1.16 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446512/normal_5fdbb535d5d61.pdfIn PDF document text
    • https://numilobes.weebly.com/uploads/1/3/4/2/134235742/dadid.pdfIn PDF document text
    • https://xufidevudog.weebly.com/uploads/1/3/4/3/134389214/solike_giderodevogod.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/gomakobez/apk_netflix_for_android.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dde4403f5353fd9590af/t/5fc1a2eb9b1ed035381998de/1606525676446/how_to_fly_hack_in_roblox.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/jogimuribusu.pdfIn PDF document text
    • https://s3.amazonaws.com/fibesezati/24597738523.pdfIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/fly_or_die_bass_trombone_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/how_have_you_been_doing_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/71551931214.pdfIn PDF document text
    • https://s3.amazonaws.com/bikikanafopavu/apush_chapter_41.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc4e907ec917750a3f1629c/t/5fcb9ab91ef6d1662ff1d67d/1607178937677/kukekoloxupili.pdfIn PDF document text
    • https://s3.amazonaws.com/palikuvexake/fepamezarewekuman.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/tamatusuwesorex.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_off0000c61d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC61D 5676 bytes
SHA-256: 4bad828a9f47a1e47892d9c0d905b6f4daa524f34d3f8b06ae8457c1525cb103
font_01_sfnt_off0000d96d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96D 10176 bytes
SHA-256: 2bd791746f0048c45793bd51d3865933c88577586c1ca757975f9df60b2ac0d1

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