Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe58c5bcfd326475…

MALICIOUS

PDF

74.2 KB Created: 2021-04-20 11:37:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: f651b3e53c2891468c79f6019331f2b8 SHA-1: e70b1520ba89345b8e6c7edf1baa943f53c61bea SHA-256: fe58c5bcfd326475de7e52c3810d5e6148a70a08bf77e4b191e9b86ea9ba85b8
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, with one particularly suspicious URL pointing to a redirector with UTM parameters, suggesting a lure to a malicious site. The document body, though heavily obfuscated, contains text related to measurements and product names, which could be part of a social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://leonvi.ru/strik?utm_term=34+mm+a+pulgadas+fracci%25C3%25B3n PDF link annotation
    • http://kenugizi.getenjoyment.net/russian_words_in_english.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390056/normal_6018c809efbd1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372985/normal_5fc8def96ff1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385847/normal_60246eaa7c55a.pdfIn PDF document text
    • http://maxoranano.sportsontheweb.net/lageplan_center_parc_bostalsee.pdfIn PDF document text
    • http://jenerotisa.mywebcommunity.org/dc_metro_map_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe962355-5851-41d5-8ca7-423f477bef12/casio_wsd_f-30.pdfIn PDF document text
    • http://misanedajog.myartsonline.com/non_megaloblastic_anemia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30745191-8fcf-464e-833c-42804f9c0f95/3149181425.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6809e74-8bca-4fe4-a602-abaefab1fd22/what_should_be_included_in_a_business_pitch.pdfIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_05720b08c72845129269102b7e3335fb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/17637bbe-7302-44e8-befc-00c03ab013d3/wobikubomusaboledopavuda.pdfIn PDF document text
    • https://8be317c1-93d6-4444-9a1c-030c84ae583f.filesusr.com/ugd/709942_6847c0e6c25442c99fa228b63b231a69.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6f8ce10-0fc0-4325-8bf2-1165e6b2af89/sarigirepodeki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a63fbf0e-0417-493b-979b-419e4191090a/predator_generator_8750_parts_list.pdfIn PDF document text
    • https://9526c93a-d340-4dca-b5fd-2864ff0888c4.filesusr.com/ugd/4c3d6a_65d5675e6d4c4626bdfa8de2b8d6916b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/274fb455-c1a8-49ea-80ba-38bff3b91993/over_the_rainbow_judy_garland_chords_ukulele.pdfIn PDF document text
    • https://s3.amazonaws.com/genedesowul/5800017495.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/best_video_making_apps_for_android_free.pdfIn PDF document text
    • http://sazurufupamaxa.myartsonline.com/celebration_hymnal_song_list.pdfIn PDF document text
    • https://36622f5a-5a1b-41a5-aa98-965156e47ac2.filesusr.com/ugd/804ff6_6022d829adef41e08a7627771c191bb4.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 5768 bytes
SHA-256: e688a5a9cbb6d815edcb6e630b51f94c8d9b0a8cb2d33eabe827496f0087ed89
font_01_sfnt_off0000f4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F4 11280 bytes
SHA-256: cc1522be845822c3d4e8891ef7e6a8234b256e6a82905c677031ba5d59f29ab2