Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a80bfda9b49da4…

MALICIOUS

PDF

69.8 KB Created: 2021-01-30 19:00:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a1322067737dea5e585a7eae12d799a2 SHA-1: c74c36f92bc4b069211e96ff0bcf243474f4e526 SHA-256: c4a80bfda9b49da4da99ce1da3809973139c906d05c48ce2b0b22eecba186201
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on dynamic DNS or free hosting services, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the document's purpose is to drive traffic to external 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://bologen.ru/wb?keyword=fall%20guys%20switch%20release%20date PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4446497/normal_5ff2dc439f854.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470218/normal_6013605a01e1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4506063/normal_5ff979f876e85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448744/normal_60111f5840734.pdfIn PDF document text
    • http://luferuvijudadof.22web.org/measuring_length_worksheets_4th_grade.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499329/normal_60046fb4b086b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416495/normal_60039bad5f890.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376358/normal_5fe73ec2f3eba.pdfIn PDF document text
    • https://tunoritusaw.weebly.com/uploads/1/3/5/3/135328070/nabatugiripet_tulak_banumam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409623/normal_5fd881209bb4b.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/midizaxopazeji/angular_2_template_example.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/typescript_react_native_template.pdfIn PDF document text
    • http://guxodolabisiruj.epizy.com/36363634989.pdfIn PDF document text
    • http://vizulubafaxal.epizy.com/90515654082.pdfIn PDF document text
    • https://s3.amazonaws.com/lebejos/crystal_report_que_significa.pdfIn PDF document text
    • http://zekarevuwo.epizy.com/sage_50_accounting_2018_update.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/south_african_culture_and_traditions.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/caremark_medicare_part_d_prior_authorization_form.pdfIn PDF document text
    • https://s3.amazonaws.com/wizidimawag/erik_satie_gnossienne_no_5_sheet_music.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_off0000d4da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DA 5352 bytes
SHA-256: d9901c6d9b3fc93d48263297ec99b467661b2a4e360d1f5384425148757d7e47
font_01_sfnt_off0000e71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71F 10440 bytes
SHA-256: 0cf09fafbea8f214b41ed0913a01b63199eef1dcd89eb5005f8f04f946f147df

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