Malicious PDF — malware analysis report

Static analysis result for SHA-256 31d740b55f88b45d…

MALICIOUS

PDF

79.9 KB Created: 2021-05-23 20:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f2753a45876e4298f8dd945f2d54f468 SHA-1: d523fcd7e9268f719609c5561ed58efacd0c372a SHA-256: 31d740b55f88b45d5c330a89d5d9eb51dfaa831394b472f78c3ecba55c492e0c
96 Risk Score

Malware Insights

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

The PDF file contains a lure related to a resignation letter and embeds a URL pointing to a suspicious domain. ClamAV and ML classifiers strongly indicate maliciousness, consistent with phishing or malware delivery. No scripts were extracted, but the embedded URI is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jumiwimov.ru/strik?utm_term=formal+resignation+letter+format+in+word PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/31551483873.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9b8057c-89d7-4c0c-9611-244fa85af4c6/tepoxiwodovolopesoga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/845bf985-186d-4013-924f-63128a1daf0c/mores.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c21e2757-16b3-40ab-a153-7c0f75b2be8f/92026133449.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/896966ac-f025-4641-9029-b1fc4a523ed0/how_high_should_a_bat_box_be.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/computer_case_fan_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/94649948646.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8dd0429-37ec-453e-a1cb-5c27df01e4fe/the_best_american_short_stories_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/kubafezin/brooklyn_nine_nine_season_1_720p.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/factoring_trinomials_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b4bc68d-bacf-4de9-bc4c-a1e7b5d50eba/xoriline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e045170e-a305-459a-81b0-544a1ea9af9c/zajur.pdfIn PDF document text
    • https://s3.amazonaws.com/zifilobesumafi/verurilopexevod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8a828f8-5092-4508-af7a-1cbacf1c0755/9794253221.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38a15658-b5c2-45d1-a8c0-eb40bdeb7e6d/29312038816.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cce4e5b6-528c-4476-a873-6bded4c09dcb/who_is_the_richest_person_in_nigeria_2021.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/66372062099.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66419ea7-a4a5-4427-9e51-0219525f8e73/kuluwejupeki.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/94911147574.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a60e9fde-b253-4819-9104-daa88eb8d433/masterbuilt_electric_smoker_recipes_chicken_wings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efa44022-eae8-4746-918d-622e7b88e7bc/kis_kisko_pyaar_karoon_full_movie_download_link.pdfIn PDF document text
    • https://s3.amazonaws.com/rexogeguxosix/how_to_use_the_z_table_in_statistics.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_off0000f9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B8 5272 bytes
SHA-256: 9fe3e171353dbeffee124a07b470f90c6e426ec5ef0afb8d750cbd8e2aed7e46
font_01_sfnt_off00010ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA1 11236 bytes
SHA-256: d16d8f144f58f5a35eda562a1bcc9ed89e007e0fc9e1dec422bb17b25fa1e190

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