Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bfd0a164cd95b96…

MALICIOUS

PDF

78.2 KB Created: 2021-03-31 23:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 5ecccf8b08d7ed7f624e19dd4a9e5154 SHA-1: 6f456bc64f092db6356a80d7ea9e23dabd38a5bf SHA-256: 1bfd0a164cd95b967f9de8e7fee5a64b15ffb6885802da05b9e72b9d9b32a56b
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant portion pointing to unknown or potentially malicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links hosted on disposable domains, suggesting a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://zajinet.ru/wix?keyword=jefferson+county+kansas+conservation+district PDF link annotation
    • http://xtrading.buzz/how_to_teach_singular_and_plural_to_kindergarten6cuga.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://foyou.store/831520557763q7y4.pdfIn PDF document text
    • http://normaa-id.com/93231678407cvled.pdfIn PDF document text
    • http://about-fb-support.com/how_to_put_a_sim_card_in_a_samsung_a10ei6bwe.pdfIn PDF document text
    • http://gelipuzag.iblogger.org/45660663397.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/14355375-afa5-4613-a916-edfa7fd91161/nagogulegodidod.pdfIn PDF document text
    • https://103360b1-34e0-4ab3-9dc6-c33ea6d96980.filesusr.com/ugd/5ecadc_750d608d816744e48727a7cb4938159c.pdf?index=trueIn PDF document text
    • http://rasuteb.rf.gd/sing_a_christmas_carol_sheet_music.pdfIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_b284b04a2f8c462e8b3d9050a271c681.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e395cc13-5bc1-4639-95af-02cb52c0f72b/how_much_is_procreate_for_ipad_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c396827-4b49-4bb9-bd2e-f0d9a0040493/jesulewetekibo.pdfIn PDF document text
    • http://kodurubakasifi.epizy.com/latex_math_symbols.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/benim_hocam_maliye_ders_notlar_2019.pdfIn PDF document text
    • https://a2fe464c-28d1-4db8-bb2d-552ad9bc2f4d.filesusr.com/ugd/941bb1_972f8fe65a3742c2a78e5a5267484ad9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d191076-d7e8-48f5-b7c9-33b1377c435b/sofifupagagilojufidazaj.pdfIn PDF document text
    • https://s3.amazonaws.com/donarepemi/apple_store_book_appointment_repair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1337b8f5-1482-41aa-acee-a6ea41297f32/suzume.pdfIn PDF document text
    • http://vilularobekose.rf.gd/fofeveluwinetetivewedat.pdfIn PDF document text
    • https://661c91a2-68a2-4ae3-aaac-ef96b6cc7894.filesusr.com/ugd/b926a8_3a23c9f3487b4572a32aebb5b67582b2.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_9eebf200e11d4d1f9e7b3bfae700768e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba65e6e4-cae3-4058-8bd3-3b5abd1c104a/68390245544.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_off0000defb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFB 5196 bytes
SHA-256: 2e25b968877e905ffe4ef87bed635baf655fe783223d76019ab26550c5d3cdf5
font_01_sfnt_off0000f0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CE 11004 bytes
SHA-256: 3ba6b3d655183f38657549b76175b8f4a3048110814a5448d54f1c9bc095a575
font_02_sfnt_off00011677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11677 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90