Malicious PDF — malware analysis report

Static analysis result for SHA-256 73581aa060e44a4d…

MALICIOUS

PDF

68.2 KB Created: 2020-12-05 05:39:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 23769a866e12783c850d9ea6c2bddd78 SHA-1: dc131c6db1c93bc940eb32de1c37f740dcba258c SHA-256: 73581aa060e44a4d55aa1fd0ba570d3d3de5c5c34210e48852798bc26fc26f73
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds external URLs that direct users to attacker-controlled resources. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://traffking.ru/strik?utm_term=biology+11.3+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384045/normal_5f9ce2242f7d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381340/normal_5fa3b8f2d9918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498404/normal_5fb5d7403d0f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415322/normal_5fa7f83399be7.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/gowebabuxogiro/57424591941.pdfIn PDF document text
    • https://s3.amazonaws.com/wibedubosateg/hoshi_no_kaabii_19.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/024bb1aa-86fd-4486-92bd-b8ca3a29426c/rofaxovum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f82cc3af-3eac-4552-8ebc-5f6b186fd56e/the_new_mutants_2020_full_movie_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20b14c40-7b4c-4aa3-bd51-283c428dbf2d/plot_development_essay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a943bae0-9643-42c4-a66d-487ed601ba01/zidokuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f374c1f-bc5b-4d55-a1a7-c8a79e603a56/94332322980.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b911.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB911 5504 bytes
SHA-256: 4d0173094b1fe4eba99cdbd41f4c8acca7bbb7c03e0ea7d2b6616836901eca52
font_01_sfnt_off0000cbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEE 10416 bytes
SHA-256: 20c6d842d3a3fded4ee79e5e7fe692270d09d5a2e70ff623bc438848a7a231b8
font_02_sfnt_off0000ef80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF80 16060 bytes
SHA-256: 313c3940a6f4aae92ceaa1b1a843de6e6f13411355a457aba6e018c383fce54c

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