Malicious PDF — malware analysis report

Static analysis result for SHA-256 e840f2ba7c715a5d…

MALICIOUS

PDF

79.1 KB Created: 2021-03-10 12:45:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 8ceaddb2d6422cd1adcdbd6c81b45249 SHA-1: 23dc3a5964730f31b6ed70428b447e37d11b4cfa SHA-256: e840f2ba7c715a5d34eae8a7ec6ba5bed1e3122675291aead4b01bd3f8dc9279
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains strings related to sheet music and application names, suggesting a lure to disguise the malicious links.

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://yafferge.ru/123?utm_term=gossec+gavotte+violin+sheet+music In PDF document text
    • https://cdn.sqhk.co/nogegamapagi/jc6oAgc/light_it_up_and_glow.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/jenhjhd/tedif.pdfIn PDF document text
    • http://temppicture.xyz/91093307652rqx1z.pdfIn PDF document text
    • https://cdn.sqhk.co/xutujipux/fehbpyL/tojesaduxomajedivipafoxa.pdfIn PDF document text
    • https://cdn.sqhk.co/kexofodatop/jjsMhbJ/grow_empire_rome_game_guardian.pdfIn PDF document text
    • https://cdn.sqhk.co/sobexufi/ogh131B/spaceship_phone_wallpaper_hd.pdfIn PDF document text
    • http://lesagotefawa.22web.org/40029970932.pdfIn PDF document text
    • https://cdn.sqhk.co/bipukawu/hhjije2/stickers_for_hydro_flask_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/mewobonovagi/UpidIu1/spirit_airlines_flight_status.pdfIn PDF document text
    • http://dlkmvkoenv.info/hindi_grammar_worksheets_for_grade_3_cbsep949l.pdfIn PDF document text
    • https://cdn.sqhk.co/zezinojox/JijVDhd/62226209399.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/hesvjWU/deer_hunter_game_free_download_for_windows_10.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/ghHSPNL/53768866791.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/ihjhgge/custom_cut_led_rope_lights.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://menawikilu.rf.gd/frigidaire_stacked_washer_dryer_wont_drain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b6533ef-1c5b-45ef-b89b-8170fc0b8ca3/43935237938.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e972c90c-3232-4be5-8c08-ae744f50b78c/how_to_use_oster_blender_food_processor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9fc2a1d-2870-480e-991b-2d116c85e960/fawulebu.pdfIn PDF document text
    • http://naremijex.epizy.com/spicejet_limited_gst_invoice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bef9b550-00e9-47e1-9a5a-48e7d3252ee9/what_day_is_the_land_of_stories_movie_coming_out.pdfIn PDF document text
    • http://fibotemirazopo.rf.gd/movipagerowimumoxesov.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD4C 5208 bytes
SHA-256: 33062d84266480a036f77ada57807be84473987c1ff2188fdd430504a58b64ce
font_01_sfnt_off0000eeea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEEA 12636 bytes
SHA-256: 5406948fa4d658904c75dc84ea87275a7a6d36dbb7174e845aa984a15eb59370
font_02_sfnt_off00011808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11808 16096 bytes
SHA-256: 61761e6c71fdd980502ce8a3a8cbf9590216241eb9eabe72fdf309a1c23cd3c2