Malicious PDF — malware analysis report

Static analysis result for SHA-256 d05a28382328f32b…

MALICIOUS

PDF

76.2 KB Created: 2021-02-19 04:48:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 243e0e05a40f54ba3f5663cfca5ee2c8 SHA-1: 9fd717a772a62f9d13746fa0b5f876366ca0667f SHA-256: d05a28382328f32bcc8b17d7e99af2f54cca4e13e5e2e97ddf395196cd9df5af
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection further support its malicious nature. The document body, though heavily obfuscated, suggests a lure related to 'Ksp contract pack clever sats', likely intended to trick users into clicking the malicious link.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/wix?keyword=ksp+contract+pack+clever+sats In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376087/normal_600c3a983bd62.pdfIn PDF document text
    • http://sikagez.22web.org/assistant_in_nursing_resume_templates.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454043/normal_5fcd389048cdd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379982/normal_5fde33578f343.pdfIn PDF document text
    • http://liteponezugom.22web.org/cia_human_resource_exploitation_training_manual.pdfIn PDF document text
    • http://lefavapexusa.iblogger.org/mabevi.pdfIn PDF document text
    • http://medivifudofo.iblogger.org/background_photo_full_hd_free.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379974/normal_5fdd4212e2118.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/kuxegu/sagixavalirikajelape.pdfIn PDF document text
    • http://nejukiwipe.rf.gd/81315790275.pdfIn PDF document text
    • http://mobisojew.epizy.com/99245275631.pdfIn PDF document text
    • http://dalonirutufitad.rf.gd/anecdotal_reading_records_template.pdfIn PDF document text
    • http://bijasubibivov.rf.gd/adobe_spark_video_android_alternative.pdfIn PDF document text
    • https://s3.amazonaws.com/daxemo/56728993531.pdfIn PDF document text
    • http://sixosotonipo.epizy.com/voxetanirok.pdfIn PDF document text
    • http://nufewaruxemo.epizy.com/deripiraberep.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/apache_openoffice_for_mac.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_off0000efa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA0 5020 bytes
SHA-256: 73083cc3d9407d7cc8ccd9fcd21af8700619534ee10aa1751f4fe48b0af6a1bc
font_01_sfnt_off000100c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C9 10288 bytes
SHA-256: c4fc3dc8d8da189bba0c19c79f0067689018f22fecf10c111c7a29e4963b988e

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