Malicious PDF — malware analysis report

Static analysis result for SHA-256 477124835f2c7c04…

MALICIOUS

PDF

74.5 KB Created: 2021-02-25 18:42:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 50e95e38e8f5fb2ef4f461c426513042 SHA-1: 7ddcf6935970c331cc191c0f52aa446161b3d328 SHA-256: 477124835f2c7c04c32b5f9e65e21ec345916de1998fa39e3cd30bb46431c122
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, many of which point to potentially malicious domains, indicating a link farm or phishing attempt. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/strik?utm_term=wu+tang+american+saga+season+1+episode+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380383/normal_6034d6c22202d.pdfIn PDF document text
    • https://duxedakaba.weebly.com/uploads/1/3/4/8/134899299/c521da84.pdfIn PDF document text
    • https://wadapunefivuda.weebly.com/uploads/1/3/4/3/134307948/menubuwedata.pdfIn PDF document text
    • https://jeketivogusu.weebly.com/uploads/1/3/1/3/131398097/1732705.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473030/normal_5ff22fc512ab0.pdfIn PDF document text
    • http://begemotiks.space/796235450515nv6k.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/haijghG/best_ww2_flight_games_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/rexadiwixox/25iaLjf/when_will_i_die_ig_filter.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366319/normal_60153e787075d.pdfIn PDF document text
    • https://felilediwifagid.weebly.com/uploads/1/3/1/4/131453780/2335791.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/fedure/tevevutobutijivatu.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/733043898.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/35569443583.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/galeropup.pdfIn PDF document text
    • https://s3.amazonaws.com/fexuror/13506061635.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_off0000e3d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D1 5560 bytes
SHA-256: 01511d14fde7a25e9b858ffd084754ec24c142c29c7014384a6c73df2b4f5f0f
font_01_sfnt_off0000f6bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BB 11608 bytes
SHA-256: 46519c865f6261eb059e74c7964e6609d839ff419c54c297ddfd18024d369ae1

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