Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0e424030663a9d6…

MALICIOUS

PDF

72.3 KB Created: 2021-02-25 23:05:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 68cfde032eea0528c56de96df4bcd0ac SHA-1: 19f7f99daa63ee334a723711d57134ca64beb52b SHA-256: c0e424030663a9d6e41d73f09afec07b8a4ef023c3ae794f59c7f51083a201cd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to 'jacksth.ru' and another to a large list of PDF links, suggesting a link farm or SEO spam campaign. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of many external links implies the document's primary function is to redirect users to potentially harmful content.

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://jacksth.ru/award?keyword=mary+poppins+returns+streaming+uk PDF link annotation
    • https://pujawemufupu.weebly.com/uploads/1/3/2/6/132680931/9487001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373243/normal_600dd2b76d6de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415291/normal_5ffe065978ab0.pdfIn PDF document text
    • https://putonikasobex.weebly.com/uploads/1/3/1/0/131070178/56ae08c1324f.pdfIn PDF document text
    • http://vanlit.ru/3225379634732pyh.pdfIn PDF document text
    • https://firulasimasib.weebly.com/uploads/1/3/0/9/130969438/fusuriwezobe-sikelurefu-pinuwamil-gawevimanija.pdfIn PDF document text
    • https://gidiwukos.weebly.com/uploads/1/3/1/3/131381706/nomaze-sajelejagusasoz-bawavoko-pofufusule.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393180/normal_5fc6b34a9189a.pdfIn PDF document text
    • https://mipijanifubu.weebly.com/uploads/1/3/0/7/130739658/8592918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464732/normal_5fe78622ccf3d.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/rizijubovapuk/fubax.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/aua_hematuria_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/anemia_falciforme_doena_monogenica.pdfIn PDF document text
    • https://s3.amazonaws.com/widiku/windows_10_nvidia_driver.pdfIn PDF document text
    • https://s3.amazonaws.com/mutirexa/aldi_talk_internet_flatrate_android_aktivieren.pdfIn PDF document text
    • https://s3.amazonaws.com/wanalovum/dusinujuxeboladuxuvijos.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/autodesk_sketchbook_app_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/bogijexu/how_to_set_westinghouse_timer_t28424.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/barbell_medicine_program.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_off0000de39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE39 5280 bytes
SHA-256: f1b77ccaa7fe2ffee9704ee08be054336c99858e4bc5232d7c3eb4ebf5afe242
font_01_sfnt_off0000f035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF035 10520 bytes
SHA-256: 1ecbeb092310b96a731104e90a88da111d4d0174499ffc78b3f4e47557945d55

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