Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f91e3578f3242e8…

MALICIOUS

PDF

178.5 KB Created: 2021-03-17 08:03:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 2dbe4aacaf1b155e2e246e69c013f453 SHA-1: 21b343bcd9e3d0d0cc0dc2d7ac82973c4381d83f SHA-256: 5f91e3578f3242e82ee73fe19faf0db1d18e5993a823400b1f608927af6fd912
96 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains an embedded URI pointing to 'vilenefex.ru', which is a strong indicator of a phishing or malware distribution attempt. While no scripts were extracted, the presence of external URLs and the overall detection score suggest the PDF is designed to redirect the user to a potentially harmful site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://vilenefex.ru/123?utm_term=ampere+turns+in+transformer PDF link annotation
    • http://instapodarok.site/pebuxukulusumapadyt.pdfIn PDF document text
    • http://raftgjgr.space/spalding_50_inch_polycarbonate_portable_basketball_hoop_system_assembly_instructionsjad81.pdfIn PDF document text
    • https://fosobezi.weebly.com/uploads/1/3/4/8/134898374/215714a7.pdfIn PDF document text
    • https://nojoxarojip.weebly.com/uploads/1/3/0/8/130813855/gevejixisit-jezumomaw-sizapugoso.pdfIn PDF document text
    • https://cdn.sqhk.co/rekosiseweno/gghbPuM/skipping_rope_training_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/takejirasomu/jajiCP8/white_cheetah_running_shoes_nz.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/xazarujokemus/tuvegala.pdfIn PDF document text
    • https://1e35b969-1f99-48dc-8aa8-d0fb9638bdc8.filesusr.com/ugd/970baa_40187b9c13db46a8b09fb814272dfd85.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/levovod/zakifekasa.pdfIn PDF document text
    • https://s3.amazonaws.com/vinivuxo/ashoka_movie_video_songs_hd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e921e63-574b-4c9b-836b-b3a2cb765c0c/define_social_contract_ap_gov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd4c5785-45f8-452d-b7ea-5e2680792cdc/the_shift_wayne_dyer_full_movie_subtitles.pdfIn PDF document text
    • https://s3.amazonaws.com/purawuma/zazixajune.pdfIn PDF document text
    • https://s3.amazonaws.com/pilazi/annotated_bibliography_in_apa_format_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b13ae9dd-8f75-4f08-96a8-ed1465aaaa80/mowipemomaseges.pdfIn PDF document text
    • https://9387bd13-3746-4408-b474-2867f26e464d.filesusr.com/ugd/ace02d_e91b1fccd36847d3a451bd5f5024f391.pdf?index=trueIn PDF document text
    • https://8fc1c2d6-49ba-4d63-8b95-0327ef2b1627.filesusr.com/ugd/1849a1_acc9792958e545f1939cae963ab810d8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc6a0327-4980-469f-864d-e7e6e16805b5/18849427839.pdfIn PDF document text
    • https://2eeb51df-07ba-4372-80d9-1ef4646fc7f7.filesusr.com/ugd/6af210_9c391a09ee4342969040c8ca718a1a5a.pdf?index=trueIn 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_off00026a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26A66 5004 bytes
SHA-256: 87df290a40a59a684f39a1faa7a4e8844a33e09858bc8c692f60433309940c43
font_01_sfnt_off00027b50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27B50 12808 bytes
SHA-256: 71b52fdc6684f766f655fdff099c3942b31fd56744e02232e845dc136a4cfc9a
font_02_sfnt_off0002a710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A710 16088 bytes
SHA-256: b96f8aa7bef1a91e0b3535ee36872af5a5fa4c489891a7584a83ca3e1b5bac29

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