Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a26d915d7863ef…

MALICIOUS

PDF

71.9 KB Created: 2021-03-08 16:40:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f506b26d3d6b8d3b8856abcd1208d1b2 SHA-1: a093e84f164e0f94aa83ec5fd0185c56ea9bb72c SHA-256: 04a26d915d7863efed2f3f4ead9089e6a10eb5fd8fb399fd058e69e27e1578a5
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to other PDFs, indicating a link farm or SEO spamming tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to malicious content.

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://nipisod.ru/award?keyword=civic+education+pdf+book PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4494875/normal_5fc5a18079927.pdfIn PDF document text
    • http://tobufupevujuma.mygamesonline.org/tunopewe.pdfIn PDF document text
    • http://vizexibidoxi.getenjoyment.net/16552946191.pdfIn PDF document text
    • http://leseweremizew.scienceontheweb.net/can_i_buy_tracfone_at_walmart.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412780/normal_5fe2aeafd7a5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388422/normal_6007fa78adc77.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/firudegix/nazutipofabadapibipakidut.pdfIn PDF document text
    • http://faleferesevo.onlinewebshop.net/25219234050.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/11672427912.pdfIn PDF document text
    • https://s3.amazonaws.com/wejuvono/negative_tu_command_form_of_servir.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/33549759903.pdfIn PDF document text
    • http://pekowob.onlinewebshop.net/wepaziw.pdfIn PDF document text
    • https://s3.amazonaws.com/masevewi/dezub.pdfIn PDF document text
    • http://xuxalonitu.onlinewebshop.net/24880626963.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/24234921264.pdfIn PDF document text
    • https://18e7ef82-5c75-44fe-ae22-4c356c2c9ce0.filesusr.com/ugd/749e61_28edc36176e34aada5b7f5505012876b.pdf?index=trueIn PDF document text
    • http://wolobugoxew.myartsonline.com/vavilerabifuma.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/46796872019.pdfIn PDF document text
    • https://4be8a7ba-6c9a-47a4-99fc-a5961b41a404.filesusr.com/ugd/132250_a848cc6bafb749f19812ce26bd414183.pdf?index=trueIn PDF document text
    • http://soranodabiwegi.myartsonline.com/58018587055.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_off0000dde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE2 5012 bytes
SHA-256: cb461141c761f986ec3a23845da8fc3abfa0bee87afb1874534fcbfd83af86d4
font_01_sfnt_off0000ef07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF07 10424 bytes
SHA-256: b2fd5262eee369a9a2981ad2cd44eaae96ddc2d93ca3428ddbc5bb07a07b02d6

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