Malicious PDF — malware analysis report

Static analysis result for SHA-256 f032ea14a6d471f0…

MALICIOUS

PDF

76.3 KB Created: 2021-06-03 03:18:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6797b233b5e376b0eef3c7b0dfae329 SHA-1: 30bf7d02aedde8173da302ee6d2ba405ecea6ff7 SHA-256: f032ea14a6d471f07de4e250592553d4cf70b0744c3abd90932113d19bdee981
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains embedded URLs, one of which is presented as a search result for employment information. The ML classifier and ClamAV detection strongly indicate maliciousness, likely for phishing or credential harvesting purposes. The document body is heavily obfuscated, preventing a clear understanding of its specific payload, but the presence of numerous URLs suggests an attempt to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cdn-cms.f-static.net/uploads/4369909/normal_604aea6557ad9.pdf
    • https://static.s123-cdn-static.com/uploads/4421336/normal_5fe30b598b770.pdf
    • https://cdn-cms.f-static.net/uploads/4417815/normal_605cb00c2391f.pdf
    • https://cdn-cms.f-static.net/uploads/4417405/normal_6046774df2159.pdf
    • https://cdn-cms.f-static.net/uploads/4389101/normal_605c49a1d200c.pdf
    • https://cdn-cms.f-static.net/uploads/4415051/normal_60319926706e4.pdf
    • https://static.s123-cdn-static.com/uploads/4469104/normal_5fc777e7ea004.pdf
    • https://static.s123-cdn-static.com/uploads/4370078/normal_6001227212868.pdf
    • https://cdn-cms.f-static.net/uploads/4458150/normal_5fd11c2cd1c2c.pdf
    • https://cdn-cms.f-static.net/uploads/4478933/normal_603e88900c7ca.pdf
    • https://cdn-cms.f-static.net/uploads/4443824/normal_60594f9820806.pdf
    • https://static.s123-cdn-static.com/uploads/4416934/normal_5fee464f45551.pdf
    • https://cdn-cms.f-static.net/uploads/4459165/normal_6064c8ffdca19.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/o_fyKxYoRT8/wb?keyword=how%20old%20have%20to%20be%20to%20work%20at%20rue21
    • http://fepewuwakow.pbworks.com/w/file/fetch/144511233/baby_day_out_movie_in_hindi_online_watch.pdf
    • http://farejutotej.pbworks.com/f/597329878.pdf
    • http://pebegijopolo.pbworks.com/f/how_many_quarts_of_transmission_fluid_does_a_toyota_sienna_take.pdf
    • http://werinenimuta.pbworks.com/w/file/fetch/144529242/how_to_eat_fried_worms_characters.pdf
    • https://uploads.strikinglycdn.com/files/cad94c86-a0f5-4a6a-843b-f7d685a48ae6/pokemon_adventures_omega_ruby_and_alpha_sapphire_manga_espaol.pdf
    • https://uploads.strikinglycdn.com/files/92caeac1-0799-4767-9e4f-5633a83dd8c0/fiputonajutenuxolijiwopo.pdf
    • http://lopofemusun.pbworks.com/f/what_is_the_theme_of_the_story_oedipus_the_king.pdf
    • https://uploads.strikinglycdn.com/files/668bf69e-7235-4ac5-8dfd-89f148384de3/black_boy_chapter_13.pdf
    • http://lekipirunezi.pbworks.com/f/88128310229.pdf
    • http://kepojijudiva.pbworks.com/w/file/fetch/144490146/feminebeluro.pdf
    • http://visetululiv.pbworks.com/f/new_kicks_shoes_quotes.pdf
    • http://lekuzax.pbworks.com/w/file/fetch/144418746/how_to_put_onn_earbuds_in_pairing_mode.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec74.bin
cb9be5e3eea67a863333fd6b265372db233aea4a682e3aa6307dd09e90101735		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC74 5236 bytes
font_01_sfnt_off0000fe50.bin
5be5ac6ff59ba728ddada639327ad2b8be47f6308ce3db1a6708b0d4c0ded348		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE50 10952 bytes

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