Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d509dc95ce3c2fd…

MALICIOUS

PDF

76.8 KB Created: 2021-03-15 22:47:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 931ad9a856534f2e08ac20080bf0f573 SHA-1: e7ade3327aa0a60e750159edbb46f2d0a65ab7a5 SHA-256: 9d509dc95ce3c2fdec9e4870bdd7915b32178de1068c1a1f03aed20abd706d9c
184 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV also flagged this file as malicious, suggesting it's a phishing or trojan delivery mechanism. The document body appears to be obfuscated or corrupted, but the presence of numerous links on disposable hosting points towards a link farm used for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=what+is+reflective+writing+in+mathematics In PDF document text
    • https://cdn.sqhk.co/dukizukijire/a7gija1/wojofotidegugorita.pdfIn PDF document text
    • http://levelupguild.com/house_of_night_tattoos_quiz8rrm0.pdfIn PDF document text
    • http://keepsufi.space/diludlpu6b.pdfIn PDF document text
    • http://italdom.fun/how_does_the_mysterious_benedict_society_endu5ym6.pdfIn PDF document text
    • http://veviwumifuvemuz.mypressonline.com/brgschaft_mieter.pdfIn PDF document text
    • http://info-pages.ru/lotawinelagpz2q.pdfIn PDF document text
    • https://cdn.sqhk.co/dodirijobadi/8iaa8ji/skater_skirt_pattern.pdfIn PDF document text
    • http://diporesorojina.scienceontheweb.net/40189601413.pdfIn PDF document text
    • https://cdn.sqhk.co/mofinopedas/hfy3jgd/mini_golf_near_me_open_till_12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379856/normal_5fe15ec49cfbb.pdfIn PDF document text
    • http://com-copyrighit.com/livro_instrumentos_mortais_cidade_das_almas_perdidaslbny9.pdfIn PDF document text
    • https://cdn.sqhk.co/lolatonuvesa/gCgjidQ/switch_games_list.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/jjbhdid/26672427169.pdfIn PDF document text
    • http://erse.xyz/discovering_geometry_answers_chapter_2._1lymbg.pdfIn PDF document text
    • http://fibiver.mygamesonline.org/the_river_radio_station_front_royal_va.pdfIn PDF document text
    • http://meetsalon.xyz/siwejunagezfrvjf.pdfIn PDF document text
    • http://prognoz-football.club/the_magus_book_explainedovu4x.pdfIn PDF document text
    • http://vknart.xyz/bejisatelegikatukegopifa7mcu0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ef6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6D 5460 bytes
SHA-256: 52934198043a03de577eeb3970d03970ac57227e8ae46e6df83ee0c4f5bbef06
font_01_sfnt_off000101f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F3 10112 bytes
SHA-256: 246c5efb03c38396ca65e7a1d2ff48b3e9cb36b78854ead66a2fc0938f843688

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