Malicious PDF — malware analysis report

Static analysis result for SHA-256 37dcec12b58cb096…

MALICIOUS

PDF

77.9 KB Created: 2021-03-21 06:02:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b330cb73ff057b9fe5a5be7106ae7039 SHA-1: bf19bfe8d94ad4247a3b574fd18756cae0055dfb SHA-256: 37dcec12b58cb09651041a9d855f952596ce749320ab5a914070b7b1a7d70477
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of numerous links suggests an attempt to redirect users to malicious sites.

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
  • 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/wix?keyword=nba+2k20+game+apk In PDF document text
    • http://confirmyourverifiedbadge.com/69024937910m0yo2.pdfIn PDF document text
    • http://faladen.22web.org/86310160105.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/casio_illuminator_watch_rose_goldzrdaa.pdfIn PDF document text
    • http://aicberg.net/can_cops_look_at_snapchatsvhczi.pdfIn PDF document text
    • https://cdn.sqhk.co/kajurineg/gT3E1d8/vector_despicable_me_wallpaper_iphone.pdfIn PDF document text
    • https://cdn.sqhk.co/wakewafo/cgdgcig/lexia_reading_core_5_level_13.pdfIn PDF document text
    • http://fakts.design/rejejukinanlr27.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/1ghVhdH/xidovabatazupixolabi.pdfIn PDF document text
    • http://erkutungotu.com/what_is_the_best_bread_maker_machine_to_buyw6otf.pdfIn PDF document text
    • https://cdn.sqhk.co/kavuweduti/b2Gjg7O/10773340360.pdfIn PDF document text
    • https://cdn.sqhk.co/bumigorawi/ehezjuQ/biological_warfare_agents.pdfIn PDF document text
    • http://laulu-go.ru/most_used_verbs_in_german9lzot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://numarape.rf.gd/how_to_use_splat_dye.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eab2dc74-4b35-42f9-abf8-541c164cdf7c/tojajapabad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/243bf3e4-ec19-412e-8729-1e53f99c0b1a/29144727379.pdfIn PDF document text
    • http://tudexobus.rf.gd/gidakojudabazalup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2c9b983-b5ae-461b-bad6-ff4eaef574a7/how_to_protect_from_identity_theft_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/653e7733-8500-4041-ad0e-15075653b436/short_stories_for_high_school_special_education_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67d039d1-fb01-44b2-8bf1-6253dc80f5ba/dominos_pizza_menu_prices_australia.pdfIn PDF document text
    • http://xikabufozajo.rf.gd/ancient_egypt_history_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/030aa948-eb0d-4697-b5bb-402082e84618/dinej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34a3ee3d-3a74-41d7-b5db-16fa6fa1b14f/99328686599.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_off0000f313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF313 5280 bytes
SHA-256: e49cad8bfddb8eac0e0d7367fa01a8cbdebf82851d40509cc1de7c725a030430
font_01_sfnt_off0001050a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1050A 11068 bytes
SHA-256: 7bac95692036d874f597f7bc1794ec74f10e56b9da8e71319d3a44d6fc586f95