Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a47878c306b65d8…

MALICIOUS

PDF

88.9 KB Created: 2021-03-24 06:00:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e5274edee8adda22de6c05d64152f7ed SHA-1: e2e2e3b48bc9f0b56e2e1cbe2f9bc03288207d4a SHA-256: 8a47878c306b65d8ff93b45bd5166126c42a392c3ef34e2dd872332b7f089da5
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, indicating a link farm or phishing attempt. The ML classifier also returned a high confidence score for maliciousness. No scripts were extracted, but the presence of numerous external URLs suggests the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/award?keyword=ontologia+definicion+filosofica+pdf
    • http://bidetoluji.getenjoyment.net/fillable_character_sheet_5e.pdf
    • http://melowew.scienceontheweb.net/pamalinobev.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jirebonudur/broiler_chicken_farming_project_report.pdf
    • https://s3.amazonaws.com/firudegix/jafuzezise.pdf
    • https://9fc80a0e-b25b-4135-afeb-9811a1ea6bf8.filesusr.com/ugd/91e123_65d808673cc9482791c2960f507ac3ab.pdf?index=true
    • https://s3.amazonaws.com/jofunozuzof/chunkzz_full_movie_free_480p.pdf
    • https://s3.amazonaws.com/gedimuta/jeep_grand_cherokee_oil_reset_2017.pdf
    • http://widusop.atwebpages.com/35775604559.pdf
    • https://be56f97b-0727-4a8e-a141-4155b83e75ac.filesusr.com/ugd/5034d0_a0032537961f43a2b71dbd6eb5dd64c8.pdf?index=true
    • https://s3.amazonaws.com/vajefam/gndu_date_sheet_ba_3rd_sem_2019.pdf
    • https://s3.amazonaws.com/jeworurowam/tameniloxokupubizesag.pdf
    • https://s3.amazonaws.com/metubevozisul/kulire.pdf
    • https://s3.amazonaws.com/zopenave/kabalogakoxoletuxijodif.pdf
    • https://s3.amazonaws.com/pipaneku/central_route_of_persuasion_vs_peripheral_route.pdf
    • https://s3.amazonaws.com/nufidibodudulad/faredujexeleroz.pdf
    • https://s3.amazonaws.com/susonanezaj/26064286179.pdf
    • https://s3.amazonaws.com/wemazun/pozupenoledizukatepad.pdf
    • https://s3.amazonaws.com/zategafozasiru/assassin_s_creed_2_highly_compressed_pc.pdf
    • https://s3.amazonaws.com/pusori/92395796029.pdf
    • https://s3.amazonaws.com/nowokil/answering_service_jobs_from_home_houston_tx.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000102d8.bin
9476a935513b260d63dad1720735986fd4747f56ac5cf53a8c6bdd4da77786b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102D8 5256 bytes
font_01_sfnt_off000114d2.bin
2aa6841225f7b7510765a133fefbbf945593559e5bc005c25e2e53317c205a67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114D2 12824 bytes
font_02_sfnt_off00013e9a.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13E9A 16204 bytes

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