Malicious PDF — malware analysis report

Static analysis result for SHA-256 d44082dbd256f181…

MALICIOUS

PDF

65.1 KB Created: 2020-11-21 15:21:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8b54fbd25b26cd4d9b8b694bad65df5d SHA-1: 24ef43cc59b3139e4250b1e682985915296b5c59 SHA-256: d44082dbd256f18165c7e46d187ee1e81f368bcbcba5b5cde17523cb9d7ee056
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying it as a malicious redirector link pointing to 'https://cctraff.ru/wb?keyword=closed%20syllable%20worksheets%20first%20grade'. Another heuristic indicates a PDF link farm, with many links pointing to S3 buckets and other domains, suggesting an attempt to distribute or host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/wb?keyword=closed%20syllable%20worksheets%20first%20grade In PDF document text
    • https://gevofiku.weebly.com/uploads/1/3/4/7/134759045/2716b58.pdfIn PDF document text
    • https://doxediseweroz.weebly.com/uploads/1/3/4/6/134634010/gaxuko-xinasixoruri-vozigomejenaxov-rojarup.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/woberiz/vajidazus.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagoba/nafowujurewenibuxetolerud.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/british_passport_application_form_download.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/mr_coffee_ecm250_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a090c23b-c79d-443b-9fa7-269d4330d8b8/liste_des_antonymes_franais.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3553f210-3626-4592-acb9-55231c847e9a/51817761453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9eb52e5-fc1f-4cce-b73d-a2829b459dd4/2156769848.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/70884781299.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/jadesi.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_off0000c2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2AF 5472 bytes
SHA-256: f029267cca512b0b6b33448ad903df0f9c58afb2e92cec9e51e71fb3ae3da2b6
font_01_sfnt_off0000d559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD559 10256 bytes
SHA-256: f9f6a425f87322d6bdf02003f2b4e8d429e1ca133c1043a21bdc836bb02eb8fb

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