Malicious PDF — malware analysis report

Static analysis result for SHA-256 58fda21f1acef80f…

MALICIOUS

PDF

76.3 KB Created: 2021-02-19 20:40:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 47c77a6a57a149dd1c0b3001f99c9723 SHA-1: 8461f3ea255bf8da43a90aad3d2a8682c0bd6ad6 SHA-256: 58fda21f1acef80fe971a056f2ceca13bf27ba9a9533d6e78abf172c0b00a547
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to disposable domains, many of which are associated with link farms and potentially phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of many external URIs suggests an attempt to redirect the user to a malicious site, likely for phishing or to download a second-stage payload.

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 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://seumenha.ru/strik?utm_term=philosophy+of+science+journals+ranking PDF link annotation
    • http://kyhni.site/wefuv3yh8g.pdfIn PDF document text
    • http://dihtyar.online/30235311661d08i4.pdfIn PDF document text
    • http://vewosanexifusip.22web.org/adding_unlike_fractions_grade_6_fraction_worksheet.pdfIn PDF document text
    • https://gazotudigexeb.weebly.com/uploads/1/3/1/1/131164446/a73938.pdfIn PDF document text
    • https://gusumadanu.weebly.com/uploads/1/3/2/6/132695601/6366a.pdfIn PDF document text
    • https://vitafidazi.weebly.com/uploads/1/3/4/7/134728623/206d4303d.pdfIn PDF document text
    • https://texexavif.weebly.com/uploads/1/3/1/4/131454683/0e85aafd63b.pdfIn PDF document text
    • http://ryduslim.website/315960248697a8f8.pdfIn PDF document text
    • https://sesemuxedewa.weebly.com/uploads/1/3/4/0/134017121/fupuverutidufemuzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476133/normal_5fda479c57ffd.pdfIn PDF document text
    • https://xowiwive.weebly.com/uploads/1/3/1/3/131398234/88dd0dff08.pdfIn PDF document text
    • https://voranafirodibug.weebly.com/uploads/1/3/2/6/132696030/c4cd743242.pdfIn PDF document text
    • http://cosmicgig.com/copy_sheet_in_excel_shortcut_key3ldbs.pdfIn PDF document text
    • http://zalixunepujo.22web.org/lake_hartwell_striper_fishing_guides.pdfIn PDF document text
    • http://xteenware.online/face_mask_wrap_around_neckg5ovv.pdfIn PDF document text
    • http://blu-ital.space/vebevitagdj.pdfIn PDF document text
    • http://summ-green.fun/best_paid_android_games_no_adszbt3q.pdfIn PDF document text
    • https://janepaxe.weebly.com/uploads/1/3/4/0/134097288/b54768ddfa097.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://jeloneliva.epizy.com/mac_performance_benchmark_software.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_off0000dd5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD5B 5324 bytes
SHA-256: 43027a770ebc297d26cbf440ecda71e458a2f2fa35605741ac274d8fcb118c34
font_01_sfnt_off0000ef6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6F 11336 bytes
SHA-256: 2b604b60098cce7553439e3173fe000dde3c63e8cf98b300230927e6dc94b348
font_02_sfnt_off000115ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CA 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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