Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef996588a1391f69…

MALICIOUS

PDF

74.8 KB Created: 2021-03-24 13:33:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c5bedf76d393f8faf9f2a5159e1f1d96 SHA-1: b1678902b94d98e6fbcbc50abe4536eefabe1aa9 SHA-256: ef996588a1391f693f36d68a7ce0a740564b5168d58e68820bccd231beb96fb8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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://mezovuduw.ru/award?keyword=dictionnaire+scientifique+anglais+fran%25C3%25A7ais+pdf PDF link annotation
    • http://naturalgood.space/my_little_pony_birthday_invitation_template0kfca.pdfIn PDF document text
    • http://navoviragumaviw.22web.org/oster_waffle_maker_instructions_use.pdfIn PDF document text
    • http://tublitalia.fun/la_foule_paroles_accordsvjt8q.pdfIn PDF document text
    • http://3-bureaureport.info/xexamaxelolmqqj.pdfIn PDF document text
    • https://cdn.sqhk.co/woluzadeviv/dIiafhj/93577005211.pdfIn PDF document text
    • https://cdn.sqhk.co/gavoduse/Ughjbif/vatorikaxajajiguxiwigu.pdfIn PDF document text
    • http://jobs-ingenieur.best/binding_of_isaac_notepad5zu5i.pdfIn PDF document text
    • https://cdn.sqhk.co/tarozawowe/hi8eLhg/tagedusowuxuv.pdfIn PDF document text
    • http://befigter.xyz/minecraft_disneyland_map_1.12.2g58j0.pdfIn PDF document text
    • https://cdn.sqhk.co/pesasotiro/7fgehHd/the_midnight_game_movie.pdfIn PDF document text
    • http://mmeueue.space/9390986249114vf.pdfIn PDF document text
    • https://cdn.sqhk.co/jomububorava/HYifXgg/89301609365.pdfIn PDF document text
    • http://reggis.info/16445901892eccni.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.site/how_to_program_xfinity_xr2_remote_to_control_tvnjfgi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://sivumokevidosib.rf.gd/assamese_dj_song_2019_asomi._in.pdfIn PDF document text
    • http://zosunofurokor.rf.gd/wozotubalen.pdfIn PDF document text
    • https://562c2315-396f-49d1-9e45-1236e049cb13.filesusr.com/ugd/ec0012_48a171deda78446c938956298f326176.pdf?index=trueIn PDF document text
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_cfa1daf678eb417992c8a344b1360dbc.pdf?index=trueIn PDF document text
    • https://d09251a9-b09e-4077-8ccb-24037f005f7b.filesusr.com/ugd/a6ce17_f98c4d8b70044dde803a3927d7d77176.pdf?index=trueIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_513b8508c2d648ef9f6dfeb3bf80cb2f.pdf?index=trueIn PDF document text
    • http://zobawukesilebaf.epizy.com/wound_debridement_cpt_guidelines.pdfIn PDF document text
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_d944e18d47b54140aca1baf685e16b2f.pdf?index=trueIn PDF document text
    • http://xutarefes.epizy.com/labus.pdfIn PDF document text
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_497e448f99514bbc87f43871239474d3.pdf?index=trueIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_822a7230c3874442a9965f87d0b8bb0a.pdf?index=trueIn PDF document text
    • https://43a2ba88-5de9-465b-b95f-6a4d82f2d06e.filesusr.com/ugd/dcbeda_0ce05307ebe342a4942442b32e68266e.pdf?index=trueIn PDF document text
    • https://45e41439-46a4-4c97-84f0-155cfeda4cef.filesusr.com/ugd/9d7ad9_1855bcf30a5f4fbeacd4b2a0fb638b09.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD508 5512 bytes
SHA-256: 6ccfebeb315f3f84d84c7e8f64a2ba00a426923e4312b5805423b2b8785ba0e2
font_01_sfnt_off0000e77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77F 11620 bytes
SHA-256: 500686d6cb87e2b331c28a5b94b3fa6445b1e03a240ac11147c96d2c5f2f36ed
font_02_sfnt_off00010cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBB 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2