Malicious PDF — malware analysis report

Static analysis result for SHA-256 457fc1370a1f227a…

MALICIOUS

PDF

77.0 KB Created: 2021-02-19 06:40:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bd234270901963c930f0bc659d50fc4d SHA-1: 906fa71e7b3c7f0b979648b399423700942566f9 SHA-256: 457fc1370a1f227a2b2c049d68c8a45dbda5542654e36ebd906776840e752ede
156 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting an attempt to manipulate search engine results or direct users to malicious content. One prominent URL, 'https://jacksth.ru/strik?utm_term=rinnai+model+rhfe-556fa', is directly embedded. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=rinnai+model+rhfe-556fa PDF link annotation
    • https://bisudika.weebly.com/uploads/1/3/4/3/134366448/3aab2.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/2959130.pdfIn PDF document text
    • https://dabusoze.weebly.com/uploads/1/3/4/5/134585091/83c3924b51cfbb9.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/sjaXJjf/comptia_server_exam_voucher.pdfIn PDF document text
    • https://wikuxokogex.weebly.com/uploads/1/3/1/8/131872144/zejexitaxako.pdfIn PDF document text
    • https://jubekufolofifi.weebly.com/uploads/1/3/4/5/134593927/4d0725.pdfIn PDF document text
    • http://bupatinewesep.66ghz.com/pirizapiv.pdfIn PDF document text
    • https://dugufenejoropez.weebly.com/uploads/1/3/0/7/130775504/ac61d14903e.pdfIn PDF document text
    • http://stickerrus.ru/boutonniere_deformity_toes5f5mz.pdfIn PDF document text
    • https://cdn.sqhk.co/damukowabij/jfPjcKB/siberian_tiger_white_cost.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
    • http://texulowiduje.rf.gd/utorrent_for_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/60027072082.pdfIn PDF document text
    • http://zavivemigowoson.epizy.com/bavori.pdfIn PDF document text
    • https://s3.amazonaws.com/firigugixujotov/spirit_airlines_flight_information_today.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/insert_a_gif_in.pdfIn PDF document text
    • https://s3.amazonaws.com/poguvelefa/lagu_soundtrack_habibie_ainun.pdfIn PDF document text
    • http://nidexivoji.epizy.com/sozufax.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e353.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE353 4992 bytes
SHA-256: ac3a557829ebb8e48c913675c8ce62d7f4b6f074a864748ddc7ab04862848208
font_01_sfnt_off0000f41d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41D 10692 bytes
SHA-256: adb1ad504f8e4e8d16aa719a2e803af73e5c0880c48000a5b1097763be5797cd
font_02_sfnt_off000118ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BA 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

Open this report in the interactive analyzer, or submit your own file for analysis.