Malicious PDF — malware analysis report

Static analysis result for SHA-256 977cea6bbec4b180…

MALICIOUS

PDF

84.9 KB Created: 2021-04-06 17:19:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: c940355ce742ede536d497cefac7f630 SHA-1: eb0976024ca56386794d797f49e5ff86ea50427a SHA-256: 977cea6bbec4b18082758c7aa55ed99d68269873766403f3abf29bc059438ece
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. 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 links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/award?keyword=historia+de+barbalha+ceara+pdf PDF link annotation
    • http://ezfix.asia/historia_chapeuzinho_amarelobox8d.pdfIn PDF document text
    • http://velavedi.iblogger.org/32561143407.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/good_housekeeper_sewing_machine_review.pdfIn PDF document text
    • http://kungfumalibu.com/rinasae2od.pdfIn PDF document text
    • http://gibelineg.sportsontheweb.net/autobiography_of_benjamin_franklin_by_benjamin_franklin.pdfIn PDF document text
    • http://fesumebujurasa.22web.org/32974915751.pdfIn PDF document text
    • http://kunozoxutokusu.mygamesonline.org/john_updikes_short_story_entitled_ap_illustrates_a_setting_that_includes.pdfIn PDF document text
    • http://rentline.pro/wadebejijuwuxajisovipivocmjr.pdfIn PDF document text
    • http://metalllift.ru/english_composition_1_syllabusmaj8x.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/a814c6c6-bdb1-44e5-8290-fb4d4d0c3ba2/5_nation_of_gods_and_earths_lessons.pdfIn PDF document text
    • http://gavawekib.myartsonline.com/lokunodux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a96ad93f-8981-4900-b65f-4e009ba5d02c/jifefelosamofusuzaluwena.pdfIn PDF document text
    • http://femiboso.rf.gd/bategoferiluwegonotezisa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2573094-5869-4bf0-b917-eb7d222d24a8/69268653998.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/149bc328-3e3e-4195-aa70-77e8a3f454d9/60246361376.pdfIn PDF document text
    • http://fopevuvowixapa.epizy.com/catheter_related_uti_guidelines.pdfIn PDF document text
    • http://buvukudoxug.rf.gd/4156882740.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab8d8596-0f93-44a0-a7d5-01be41938ba0/princeton_review_free_mcat_reddit.pdfIn PDF document text
    • http://nopatiget.epizy.com/ruxote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66f26c68-1da1-41a3-8e0b-3f3c06c6a4d3/did_forrest_fenns_treasure_get_found.pdfIn PDF document text
    • http://revarupipi.epizy.com/math_games_for_grade_6.pdfIn PDF document text
    • http://gegilifopom.myartsonline.com/96857863812.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_off00010630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10630 5344 bytes
SHA-256: 8f790e9f11e2d2357fb9abe23c20b56b808f5c971999ce3e78c7ecf975d75e0d
font_01_sfnt_off0001184a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1184A 14508 bytes
SHA-256: d731aeb29c7669ad3ee5114c3d2a263da5238933cafb7b561d31f5e2388dd7fc

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