Malicious PDF — malware analysis report

Static analysis result for SHA-256 f28e50e792a58918…

MALICIOUS

PDF

76.4 KB Created: 2021-03-08 07:35:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e893184c6f388aed3d8b5468fd2325f2 SHA-1: 7a678cdb6e3fe6f467c18249dbce8fdbbe921cd5 SHA-256: f28e50e792a589186bbeec46b9859619675662b536821d63cca89189dc0ec2c6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF files on suspicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body appears to be corrupted or contains minimal meaningful text, but the presence of numerous external links is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/wix?keyword=courtyard+creations+patio+furniture
    • http://lizowaw.scienceontheweb.net/tasezexejamunig.pdf
    • http://vufajed.getenjoyment.net/57556564475.pdf
    • https://cdn.sqhk.co/pulununese/hhZhdaz/24621504490.pdf
    • https://lanutitokoxoziv.weebly.com/uploads/1/3/4/0/134096970/6426986.pdf
    • https://cdn.sqhk.co/nuwobevina/aDhjiaJ/bopidabanufedimiwobi.pdf
    • http://vuwimoxit.mygamesonline.org/what_was_going_on_in_germany_in_1912.pdf
    • http://zaxiluxedexu.getenjoyment.net/48673260543.pdf
    • https://cdn.sqhk.co/kevejonob/gcjcghR/50664718424.pdf
    • https://cdn.sqhk.co/velujuvaxal/joyia6r/paradise_island_bahamas_airport_code.pdf
    • https://xevumijujivo.weebly.com/uploads/1/3/1/3/131383583/6269692.pdf
    • https://roguraluvi.weebly.com/uploads/1/3/0/7/130776180/zolibatalifut.pdf
    • https://cdn.sqhk.co/buzovegom/ibidhe6/my_talking_angela_games_download_apk.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://80c8fd16-4cf8-4f9f-b52b-d6c956df8f3b.filesusr.com/ugd/1a94e8_b34a7a0807364bf0bbf0fe6c7a4451c4.pdf?index=true
    • https://s3.amazonaws.com/fonazuzixagizir/background_eraser_for_pc.pdf
    • https://fc06435f-e709-4c80-b59d-96fa470c1a13.filesusr.com/ugd/bdc04d_b8c945e9cb5c4a12bcdc3e04dd8aa919.pdf?index=true
    • http://xuvekixofeku.onlinewebshop.net/4963144250.pdf
    • https://s3.amazonaws.com/mexesazaxasa/permutations_and_combinations_independent_practice_worksheet_answers.pdf
    • https://71a5d838-4e22-4830-8da1-7955ec3365f5.filesusr.com/ugd/f2f43e_5f1462aebd074ccb8e64c2054394576d.pdf?index=true
    • https://3f5765b5-411c-4b28-96d1-a1e3b219bcee.filesusr.com/ugd/ca847e_ace337445e114d1d958d1da2cd273a5e.pdf?index=true
    • https://s3.amazonaws.com/julexekubaj/albion_leveling_guide.pdf
    • https://s3.amazonaws.com/desekusoxi/pediatric_pneumonia_treatment_guidelines_2018.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de8c.bin
b36d9c1c5a34d63315738715ef467addfb0ed82f1046e2ab4d6147d75f3f5097		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8C 5124 bytes
font_01_sfnt_off0000f016.bin
bda8f9998a0f5b8c3721a2eb678dc861ac1123167d32ebf9afb0d6c91a512148		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 11280 bytes
font_02_sfnt_off0001165a.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1165A 4324 bytes

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