Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a81aa4d6cb8ed90…

MALICIOUS

PDF

67.3 KB Created: 2020-11-22 01:44:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b904936993d01f18df59c7670e6bee67 SHA-1: 67de1847881376dfff4f03d91382230ceada2c61 SHA-256: 6a81aa4d6cb8ed90ca563b8ae8b9e41cab5a4ccb63e963ffca3ca5b27e9e3148
154 Risk Score

Malware Insights

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

The PDF file contains a link to a known malicious redirector URL, identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text suggesting a lure related to accessing the darknet. The ML classifier and ClamAV also flagged this file as malicious, indicating a high likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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/aws?utm_term=comment+acceder+au+darknet+avec+android In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371265/normal_5f9a8d232f1ad.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/lazolu/28500380619.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/ffxiv_leviathan_extreme_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/vuradizelibuwifuv.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/58217007945.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/big_ideas_math_algebra_1_california_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b48a40e4-b03c-4412-a6d0-c3e46dec7b0a/risunamuloxisixokupap.pdfIn PDF document text
    • https://s3.amazonaws.com/babuxufarizuxur/1990_mazda_miata_shop_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/davawina/breast_pump_reviews_consumer_reports.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c09e0b75-4d1d-4e32-9380-88628bbc3b2d/rukivuguvuxub.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/european_oncology_nursing_society_extravasation_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75fa03ca-bcd7-461b-99ea-43d80dc7afa8/gexilabinumemolorem.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/cms_hospital_infection_control_worksheet_2020.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_off0000c751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC751 4904 bytes
SHA-256: 88fcc4669d188f06c7b6fbadaddfc060e74d1d269a3468c727f05d3400755d3f
font_01_sfnt_off0000d7ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EC 12300 bytes
SHA-256: 0a2789d83142f84b931cb0d5a58e047af1283ef884a148e5ba2843c3be211304

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