Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d318a0b3345a56e…

MALICIOUS

PDF

89.3 KB Created: 2021-01-23 18:18:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: c52a2bd27a4cc1eebf36e07f77408f2a SHA-1: 935d36a3abe7d141b9dab5941585e8c3dad965af SHA-256: 8d318a0b3345a56ef32823d64a80eca707f847aca9325b31d6b1171304bf9cde
164 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 other PDFs, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/aws?utm_term=cara+membuat+google+form+excel PDF link annotation
    • https://resonorur.weebly.com/uploads/1/3/4/8/134874279/ecc29551b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414678/normal_5fdbb1b7e307b.pdfIn PDF document text
    • https://site-1177116.mozfiles.com/files/1177116/gibuwidefakozeb.pdfIn PDF document text
    • https://pedumodab.weebly.com/uploads/1/3/1/6/131637036/5110e09d5a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465006/normal_5ff803585d706.pdfIn PDF document text
    • https://site-1243998.mozfiles.com/files/1243998/lokugapemiwudenetagoran.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371509/normal_5ffb7c4027b93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411701/normal_5ffd2b7a8adc2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498868/normal_6003736875728.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454550/normal_5fd2dd7402154.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410459/normal_5fcbf3654c748.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493282/normal_5fcbbf4d9c2a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kipixuge.epizy.com/lusarulufotuxufiliti.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/free_carfax_report_no_cost.pdfIn PDF document text
    • http://jevoneloz.epizy.com/xy_scatter_plot_google_sheets.pdfIn PDF document text
    • http://gezewezelatemak.epizy.com/chaupai_sahib_in_punjabi_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/yavapai_county_visitation_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/gopuze/2014_camaro_ss_convertible_performance.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_off00012055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12055 5136 bytes
SHA-256: 067a185e172fcbff4358502302d2333b45a361692f23877e8d5b13b061ea50c6
font_01_sfnt_off000131c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C3 10700 bytes
SHA-256: 3f21b56856b615365ff6c733d7ec415098a1324ac746aba15ea4992519543977

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