Malicious PDF — malware analysis report

Static analysis result for SHA-256 040f6340f3a78d51…

MALICIOUS

PDF

68.5 KB Created: 2021-03-06 16:46:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2a4c10c17d996ca4de73e43741f9c1a9 SHA-1: ae29208946f6e1f1ea7270f27b69b1c200bd2275 SHA-256: 040f6340f3a78d51c7d0da6734359a1728f95cab3cf2642cbe84e4cbaf1ffea9
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains a large number of embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though truncated and partially garbled, contains metadata related to PDF creation and website content, which is likely a pretext for the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://gimoguvi.ru/award?keyword=add+pdf+files+to+wix+website PDF link annotation
    • https://cdn.sqhk.co/mesafovojifo/gdjhkqo/84337361824.pdfIn PDF document text
    • http://buytoday.cc/88643015742tjy8t.pdfIn PDF document text
    • https://cdn.sqhk.co/xobabowiwa/F5iashe/mobizen_screen_recorder_for_pc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450639/normal_602561d3687eb.pdfIn PDF document text
    • http://mybestchan.online/mipabubelivemuxivesasodapqa3g.pdfIn PDF document text
    • http://dsv-trening.ru/In PDF document text
    • https://cdn.sqhk.co/leburogutu/njdjgji/84610128525.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421768/normal_5ff206e407971.pdfIn PDF document text
    • http://energytik.net/38037167262hotzu.pdfIn PDF document text
    • http://giftcard-sale.store/vishnu_sahasranamam_download_in_telugunpvyd.pdfIn PDF document text
    • http://teagreen.space/24781753123r3khc.pdfIn PDF document text
    • http://keepqifi.site/what_are_the_techniques_of_teaching_science0njzh.pdfIn PDF document text
    • https://cdn.sqhk.co/gediwuwanol/BAxjiHa/47079862055.pdfIn PDF document text
    • https://cdn.sqhk.co/piwuzuberaze/gu0tnie/50816218397.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424996/normal_5fd65a20cd669.pdfIn PDF document text
    • http://delayikapy.xyz/old_school_gospel_music_playlistbl0bs.pdfIn PDF document text
    • https://cdn.sqhk.co/migixurej/Kx4ihyK/renolixo.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/a5940e35-c48a-42d6-a7be-9299fa277c7c/bekagifanafu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29d6a0e2-cf80-49fa-b007-caa83cb79208/vuzimetulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7f7459c-9188-44d5-8679-a3ee829bc7c4/90954799496.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_off0000d15f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15F 5020 bytes
SHA-256: b84bb50b01a8509601963af2ab3d459a0a5f9c9c6b18a9c2f433314cad495b5d
font_01_sfnt_off0000e29c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE29C 10068 bytes
SHA-256: df0fa8b50bcbdf68c450b073cb022c70b8a06967bbfcbe1840d851b52bf5d136

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