Malicious PDF — malware analysis report

Static analysis result for SHA-256 449a232bfa70e9de…

MALICIOUS

PDF

70.3 KB Created: 2020-11-18 17:01:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 389f552bf2291f179d6929e31fbf8235 SHA-1: 7f106c7fcfa5bf2e62c7d70112eff654bf507e81 SHA-256: 449a232bfa70e9de12a5298054ab46350e1edafc01bc4c0d96e84e80cb89dcfd
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or phishing campaign. The heuristic PDF_SEO_LINK_FARM firing indicates a mass of external PDF links, with the primary example being https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/mesalologixanugofiso.pdf. The ML classifier and ClamAV detection strongly indicate maliciousness, likely for phishing or malware distribution.

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://trafffi.ru/strik?utm_term=fruits+and+vegetables+english+worksheet PDF link annotation
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/mesalologixanugofiso.pdfIn PDF document text
    • https://ziwarafe.weebly.com/uploads/1/3/4/3/134306838/4511c4d.pdfIn PDF document text
    • https://gukepofefefika.weebly.com/uploads/1/3/1/4/131437977/donazumeta_kaxowanebubuk_likomitide.pdfIn PDF document text
    • https://talowitutujuf.weebly.com/uploads/1/3/3/9/133999148/8394560.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411483/normal_5f9c0f71a9d37.pdfIn PDF document text
    • https://pidadilux.weebly.com/uploads/1/3/4/6/134666204/kovolobox.pdfIn PDF document text
    • https://xipunozelizu.weebly.com/uploads/1/3/1/3/131382486/2070851.pdfIn PDF document text
    • https://zonerizarom.weebly.com/uploads/1/3/4/3/134310007/8069433.pdfIn PDF document text
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/6789685.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/sorogamat/favukowekibanaboretomu.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/avast_cleanup_premium_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c686705-ad92-4489-ad2b-8119d12568aa/wazisazajudulaxabetenasu.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/nasubuvonaj.pdfIn PDF document text
    • https://s3.amazonaws.com/jevuxozazebazug/tyrones_game_shack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/918a9c73-b398-4a2c-906d-b84671301af1/70777369717.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/ps4_diablo_3_crusader_builds.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_off0000c7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DC 3520 bytes
SHA-256: e3af8a6eb12c30e5ca4e53064d73fd91202ba5ce31cd09c7cc7ce2bafdeb6f3c
font_01_sfnt_off0000d43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43C 5396 bytes
SHA-256: 8510643ba6effdd43f9ae40c7c10f87bbd9a0167cb16706300327b9801d21776
font_02_sfnt_off0000e6a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A6 10360 bytes
SHA-256: cbdb44f969e55f46e44163a509b38ac51512668324dc16efeac5e059eb40ee99

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