Malicious PDF — malware analysis report

Static analysis result for SHA-256 24ac77540c4121f8…

MALICIOUS

PDF

88.0 KB Created: 2021-03-30 01:52:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bde334f876999c1e8048497e79207e69 SHA-1: 726bb0f7ad918654691d2ab10deed8488559bf8f SHA-256: 24ac77540c4121f8435d531bce2e047a871b09d2d6f6de4172f95fd2ff7ced43
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, a common tactic for phishing or malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting an attempt to direct users to potentially malicious sites. ClamAV detection and ML classification confirm the malicious nature of the file, likely serving as a lure for 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=first+aid+book+2021+pdf PDF link annotation
    • https://cdn.sqhk.co/xefilelo/hdZQGgi/minecraft_earth_apk.pdfIn PDF document text
    • https://vuderuxedus.weebly.com/uploads/1/3/4/6/134692959/jisanuwub_duwazu_wijinobebiv.pdfIn PDF document text
    • http://jafofuk.iblogger.org/73727263314.pdfIn PDF document text
    • https://cdn.sqhk.co/lusikagidet/i548hjV/atualizacao_brasfoot_2020_janeiro.pdfIn PDF document text
    • https://cdn.sqhk.co/ketalidukepi/ikoItii/h_and_m_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/rubupidorinu/hajaFjf/59902949674.pdfIn PDF document text
    • https://pemejelusapi.weebly.com/uploads/1/3/1/3/131398576/gisawelesoteliku.pdfIn PDF document text
    • https://cdn.sqhk.co/kunutewiwit/Ujaxlhe/pewdiepie_you_laugh_you_lose_challenge.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/f37f7b4e-5d4a-4fd7-8a70-5c1cdbc53618/kijivixagodelakugi.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/disgraced_ayad_akhtar_themes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf2d0326-5854-49b1-8fb0-634f44e2b2e5/50673470836.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatesawodiji/amman_kovil_vasalile_song_starmusiq.pdfIn PDF document text
    • http://duzobujunetokuz.epizy.com/31671478046.pdfIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/jerexepake.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/68976466842.pdfIn PDF document text
    • http://zujawuka.epizy.com/74657756431.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66290506-8616-470c-8e85-f455c68c4d70/89507783547.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/lolemomun.pdfIn PDF document text
    • http://vawazovuvisu.rf.gd/dictionary_of_body_language_joe_navarro.pdfIn PDF document text
    • http://jepexafowuxa.epizy.com/perimeter_and_area_of_shapes_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8da3fb64-cfc2-4bbc-baea-f013d2eed902/graphic_design_courses_institute_in_pune.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_off000119cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CB 5488 bytes
SHA-256: 4f1d4b1300dc557a6daeddefb3e1dd8d1348f28bb772b3b76cfb22aec279226c
font_01_sfnt_off00012c89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C89 11984 bytes
SHA-256: e445e796b7f84ad8fdaadce33cf877cd81b13bf13092d537e3c81f53053ea4d4

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