Malicious PDF — malware analysis report

Static analysis result for SHA-256 5786c0c48ad3b569…

MALICIOUS

PDF

198.6 KB Created: 2021-05-08 06:04:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ef1aac11be4e2f3663005079e59c1406 SHA-1: faf51b4787bdcc78a92da4d18bfb242b31385c32 SHA-256: 5786c0c48ad3b5694f7cff084cf2251bcb87822791bd3846c014a583bf8d5855
96 Risk Score

Malware Insights

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

The file is a PDF with a high ML classifier score and ClamAV detection, indicating malicious intent. The document body and embedded artifacts suggest a lure for a book download, but the primary malicious activity is likely related to the external URI. The presence of PDF_URI and EMBEDDED_URL heuristics points to the use of external links for malicious purposes, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://golowaki.ru/strik?utm_term=libro+por+el+placer+de+vivir+cesar+lozano+pdf+gratis PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4501810/normal_5fe49a25f389f.pdfIn PDF document text
    • https://dipitamadupod.weebly.com/uploads/1/3/4/8/134882687/kulabuso-nopuxipaja-kimarik-dixobudene.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370090/normal_6068d071113ed.pdfIn PDF document text
    • https://tapulebuzaxu.weebly.com/uploads/1/3/0/8/130814605/xeweges.pdfIn PDF document text
    • https://laropavo.weebly.com/uploads/1/3/4/5/134585926/48f2acb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488133/normal_5fcb1b40e6982.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/fizup/50652725761.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13459c1c-2357-47cf-a954-d3a796db9103/necromunda_underhive_wars_tutorial.pdfIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_bd6dc6692dff4b5eac73a63b1106f195.pdf?index=trueIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_534f9fa13c5d4394a1d8f239dd6c4564.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fifuto/allure_report_testng_maven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e0d8aec-2e98-496f-ab9a-fcaaec3f5315/which_of_the_following_statements_is_true_about_direct_evidence.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c6ae75c-b152-4c77-829b-fc870eeb8ebf/how_to_update_blackmagic_firmware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6dec4b85-1629-415a-957a-5cb169455bf9/bipuduboj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9617aafd-22fb-497f-9333-7c81f5c5ad00/windows_7_resource_kit.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_off0002ce53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CE53 5516 bytes
SHA-256: d0d45113d9d230887e54e8eb162fa2626c3b6843a8fe678d1e5368ec381ae917
font_01_sfnt_off0002e130.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E130 12620 bytes
SHA-256: 7e248d378fbe4fa69ececd1a77a9f9399a45333950cab40d5f95ce29e6325e06

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