Malicious PDF — malware analysis report

Static analysis result for SHA-256 204276f4668b2c0a…

MALICIOUS

PDF

65.6 KB Created: 2021-03-29 05:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: b08f2985eb0e5128c9cdf627b367962b SHA-1: 2675320948ea9f4c2b32bb47704fdada0ef5db60 SHA-256: 204276f4668b2c0a93ca406c6c7fc2f9ef04ce24d7eef8343f66063809d6c349
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning model assigned a high probability of maliciousness. The document body, though heavily obfuscated, contains text related to 'how to write an inequality in interval notation' and a URL pointing to 'nipisod.ru', which is identified as an SEO redirector for phishing. This suggests the document is designed to trick users into visiting a malicious site.

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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/aws?utm_term=how+to+write+an+inequality+in+interval+notation PDF link annotation
    • https://cdn.sqhk.co/xafiguzi/pjc5ig4/knights_of_columbus_hall_locations.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476758/normal_5fdc794361db6.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/qCyRcJP/fdic_call_report_glossary.pdfIn PDF document text
    • http://artyom.guru/realtek_high_definition_audio_driver_windows_10_64_bit_toshibav82uy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471236/normal_605f7d02618e1.pdfIn PDF document text
    • http://legrand-spb.ru/kali_linux_nethunter_for_android_rootujifc.pdfIn PDF document text
    • http://update-win20.online/jomomufovegitonexopihlf4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480589/normal_5fdc2f193cd3c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7de37393-df1d-4628-a9ac-733c0eb485c4/xebitinunujod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a1a684c-5cdf-4e47-b480-e8ea14f2e2b8/91532142920.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/20231235738.pdfIn PDF document text
    • https://s3.amazonaws.com/vavabi/49031844328.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e80f842-30ee-4c08-80ea-1e7b6f605733/homelite_gas_trimmer_parts_canada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0e65243-38bc-45dc-a01d-52841f301ce5/jizur.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/94695458204.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f3c02b4-e4fa-4bb6-9530-351bdb05cf02/nawumodizusugezari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/840e9e27-1825-40d2-a09a-a56dd43aac95/how_much_do_hospital_cleaners_earn.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56575a24-36d0-4589-9a40-44ae60e4bb49/gujogafo.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_off0000c566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC566 4840 bytes
SHA-256: dd8e35a8c5bc42416cb1ad2ce346d71c3654ab0f357d0b208b83818ef9e35aa2
font_01_sfnt_off0000d607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD607 10300 bytes
SHA-256: 38fda690f05d1009d955b3494533acfe101f2b42f7679a7a936f4232172e1df6

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