Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b3f287ed3077cf…

MALICIOUS

PDF

71.6 KB Created: 2021-04-03 10:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ea1e71e8a4161d0dd488263ce154060d SHA-1: 5b1924d0c529b10f71fc29c0eadd3523ca5ff37f SHA-256: 66b3f287ed3077cf6a2d8ee57d249ce3b163a6116d66cf146d67c541f4a46cd8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malicious intent. It contains a large number of external links, suggesting it's part of a link farm or SEO manipulation scheme. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly indicate the document's purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/wix?keyword=roadkill+cafe+maine PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4493201/normal_600349068cff5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459029/normal_5feff73aa0912.pdfIn PDF document text
    • https://tipolapuponawog.weebly.com/uploads/1/3/2/6/132696210/5e2bb411f2a6.pdfIn PDF document text
    • https://nesamakamaxo.weebly.com/uploads/1/3/1/6/131636712/zelemoxa_paretumi_jepefidalitis_nawiv.pdfIn PDF document text
    • https://bawigadumifop.weebly.com/uploads/1/3/4/4/134494387/rigeforar.pdfIn PDF document text
    • https://vusuranozaxo.weebly.com/uploads/1/3/4/0/134012668/nafegaporetef_ganorogorisip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471995/normal_5fddb46170ca8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386597/normal_5fe98f7076544.pdfIn PDF document text
    • https://logifuvixejexa.weebly.com/uploads/1/3/6/0/136019385/6785434.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475391/normal_604cf0f217489.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485568/normal_5fc74a5c82662.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408323/normal_6006b0cc50811.pdfIn PDF document text
    • http://xalebiru.iblogger.org/motorola_droid_mini_xt1030_battery_replacement.pdfIn PDF document text
    • https://tusosalowikos.weebly.com/uploads/1/3/1/4/131453146/3504198.pdfIn PDF document text
    • https://nosobafib.weebly.com/uploads/1/3/1/4/131438228/zesasemomaxodixo.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/xipavir/pivevusigotakovuxeg.pdfIn PDF document text
    • http://vivusefodubelep.epizy.com/how_to_cook_a_rib_roast_on_a_showtime_rotisserie.pdfIn PDF document text
    • https://s3.amazonaws.com/laradusa/business_plan_template_for_small_businesses.pdfIn PDF document text
    • http://pewafup.epizy.com/aireadores_de_paleta.pdfIn PDF document text
    • http://gojudupawoziwex.epizy.com/galena_fall_color_report.pdfIn PDF document text
    • http://livofos.epizy.com/zokogolipan.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_off0000d8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E9 4964 bytes
SHA-256: 87d996de7710e941b8fc292e4bbd1f38eff49de7a65d20fc7149807bf912d9e8
font_01_sfnt_off0000e9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CE 11716 bytes
SHA-256: 9d128541650236e402c4387423bc759779df67031e7f71559a7d0386884db45e

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