Malicious PDF — malware analysis report

Static analysis result for SHA-256 14cbd3cde54bfbe5…

MALICIOUS

PDF

77.3 KB Created: 2021-03-19 03:24:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b7fc949408d964f9b52d5dc2c032ab11 SHA-1: c2f1c9a1bcd2805bb7d3f94d94060d912ebc40e4 SHA-256: 14cbd3cde54bfbe50e398699899b555dcde7ed918afbad116d4abfc57f785545
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to redirect users. The presence of 'cmd.pdf' in the document text and the ML classifier's high confidence score further indicate malicious activity. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://xezojetit.ru/wix?keyword=turbo+ls+build+cost
    • https://cdn-cms.f-static.net/uploads/4377095/normal_60297c93e7d30.pdf
    • https://cdn-cms.f-static.net/uploads/4496824/normal_5fda6c4c7f1b4.pdf
    • https://kekisadubivef.weebly.com/uploads/1/3/3/9/133986731/404970.pdf
    • http://hocostyle.ru/jbl_xtreme_2_review_youtube500t2.pdf
    • https://jefiwoso.weebly.com/uploads/1/3/5/9/135996081/4972798.pdf
    • http://digtalcaliper09.xyz/28888353058nfw1k.pdf
    • http://beliyden.xyz/lijesubkruhb.pdf
    • http://skidki-day.shop/buduwueyo2v.pdf
    • https://jexelokase.weebly.com/uploads/1/3/5/3/135321670/wusumoperisavi_vazixetos.pdf
    • https://wosobariwosamu.weebly.com/uploads/1/3/4/3/134372044/sigagevaga-zatomena.pdf
    • https://cdn-cms.f-static.net/uploads/4406514/normal_6030fdb3847b7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/220847ff-e9b9-49b5-aaa9-400ad6dabc97/zuwakulibepirevinatof.pdf
    • https://uploads.strikinglycdn.com/files/3b09ab7f-1c34-4773-8ef4-ce5b93cb4489/what_is_a_illuminated_manuscript.pdf
    • https://uploads.strikinglycdn.com/files/e55e373a-a178-4e0b-bc65-67b017d04a9c/92423122331.pdf
    • https://uploads.strikinglycdn.com/files/d3677a63-c707-4cb5-8c26-ac949d0d0910/86120736731.pdf
    • https://f766a7e9-a0d0-4e3a-bf7c-946d2e8c2ff4.filesusr.com/ugd/bddb96_5fadc80b160f487eb2337f2d24cadf96.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c02ac3cc-9487-4bcb-9c4f-c0c5e1888b38/80839202627.pdf
    • https://uploads.strikinglycdn.com/files/b9afc559-96a4-4835-977d-c2787eaebbc3/how_many_books_in_series_diary_of_a_wimpy_kid.pdf
    • https://uploads.strikinglycdn.com/files/2bf627f9-ece1-441d-b944-6ea202baaa3f/presonus_studiolive_16.4_2_manual.pdf
    • https://uploads.strikinglycdn.com/files/8e53b201-9d9c-45e7-b0b1-6d123650f9c2/vetifi.pdf
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_7728234860c746dc98e7390a9dce9143.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f748b908-369c-4893-9d7e-cd1a5478acf1/how_to_start_paint_from_cmd.pdf
    • https://uploads.strikinglycdn.com/files/f11d173a-52b0-4548-87a5-d4581f621ac8/63378290853.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • https://uploads.strikinglycdn.com/files/f11d173a-52b
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f290.bin
82756de7cdd6ed83ddfffb9c7d344786ba97edac38bddd0e74f96cab8083d5a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 4812 bytes
font_01_sfnt_off000102f7.bin
2f8287fb65db4b8ca155a2edf80459fdca1e4bf1278b66bd9e05979564962b8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102F7 10824 bytes

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