Malicious PDF — malware analysis report

Static analysis result for SHA-256 51e38be0760c82ad…

MALICIOUS

PDF

84.6 KB Created: 2021-04-15 02:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e9297ca8be72190fc8adfad70d0d949a SHA-1: b173c991ecf440b42b5b52d13fdbcc53d2e68304 SHA-256: 51e38be0760c82ad848cc128d54fe0f5976254e3b4f403ba4a7425ad4d2c46d2
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, and uses a deceptive title related to accessing Samsung TV service menus. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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 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.
  • 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://jottigo.ru/strik?utm_term=how+to+access+service+menu+on+samsung+tv+without+remote PDF link annotation
    • http://silusexiva.iblogger.org/british_english_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496372/normal_602217d680568.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405409/normal_6029fdd2f20fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423454/normal_6003cbc5bdcdc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://7a9095e9-4ba3-4ff7-9406-a75d0382ce8a.filesusr.com/ugd/db93e9_84e48d6939be4290a891c09614d22c44.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/dee928cb-6c5f-4a3d-a65c-587df2a30909/19513253618.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff92c0ba-efd6-4c44-a9a7-ecf8cf507ce4/pigopevikezitilupapataw.pdfIn PDF document text
    • http://tibitefibipawiz.rf.gd/viwezekunabar.pdfIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_dc605e902fb140b49c41bad9b7d92a34.pdf?index=trueIn PDF document text
    • https://22fea36a-5e19-4af1-b4aa-fe6e1efe0ee9.filesusr.com/ugd/b5a188_82c034d127684cf681c2b9ebb778a352.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52bb4eee-9329-4433-a501-e8f171d1c5ad/best_memes_2020_kenya.pdfIn PDF document text
    • https://2a984544-7cb8-4a4d-9f60-e686f7994e39.filesusr.com/ugd/1434d3_419ec531b9704bbb974b7e212140c8e9.pdf?index=trueIn PDF document text
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_7dfc646b826149d5a28ece5b2f2aecd7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9c92229-2f83-403c-9e7f-e6aa713429f6/fomevubebitukikekula.pdfIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_71b8e8e60a7040fab4f6dde997de4193.pdf?index=trueIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_fc31543e56e24223a69ec968fd7e8b9b.pdf?index=trueIn PDF document text
    • https://60b161a2-b511-46bc-b48c-7ca4331f2db3.filesusr.com/ugd/34b71b_9b21079e7a104db79dbc399db7d9a564.pdf?index=trueIn PDF document text
    • http://lubuzasoxevixan.epizy.com/jobofixubunowinezabulebuj.pdfIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_d9c088b1ed00453787a4b10f2fcf9013.pdf?index=trueIn PDF document text
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_9c7337082ce04ca7b3aee1fb7b7b283a.pdf?index=trueIn PDF document text
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_bed8490905dd45adb1e1bd0963ca602e.pdf?index=trueIn PDF document text
    • https://4465b75e-e642-4f53-8c89-e22f0b9d4994.filesusr.com/ugd/ecd213_cfe0aaeaa8a54224853558f5179a445b.pdf?index=trueIn PDF document text
    • https://3d73ec66-e24e-4607-99a5-aa3c333c10ea.filesusr.com/ugd/a96454_5d9e9870936e4680814aa7179631a164.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fec8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC8 5176 bytes
SHA-256: 1b6354052a4ae9a42f8f41530e9d664b373ffeb423585f01efab54f93125f274
font_01_sfnt_off00011044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11044 10596 bytes
SHA-256: f656eabda102f3996bc8771b76a1f4846927524b8bb057be85eba9560a85d25b
font_02_sfnt_off0001346d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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