Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec8b279305e1c75…

MALICIOUS

PDF

78.0 KB Created: 2021-04-03 01:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02446a0ff9831c9ba9162c5fe8558d9c SHA-1: 7483c4a3b33a4571e0fb56382dfcbb5629afde55 SHA-256: 8ec8b279305e1c751467a38d2f8481115e8357d8d0f7e5375a702eab37872ca8
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating high maliciousness. It contains a large number of external links, suggesting a link farm or redirection mechanism to malicious sites. The document body, though heavily obfuscated, contains a query about appliance maintenance, likely a lure to disguise the malicious intent of directing users to external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/strik?utm_term=can+the+keurig+water+reservoir+go+in+the+dishwasher
    • https://cdn.sqhk.co/salefudodid/vUhjjBN/xibivefobirojuwugab.pdf
    • https://doxorovovo.weebly.com/uploads/1/3/4/4/134479089/3447064.pdf
    • https://benesigonej.weebly.com/uploads/1/3/1/6/131607635/narewigafalugipewuk.pdf
    • https://cdn.sqhk.co/definuseju/hhDBugj/reversi_free_master_game_the_othello_masterpiece.pdf
    • https://jizufuvarax.weebly.com/uploads/1/3/1/1/131164460/3438096.pdf
    • https://cdn.sqhk.co/bebetirifam/hepha62/21016713228.pdf
    • https://cdn.sqhk.co/teposodigar/hjhBdx2/roi_formula_managerial_accounting.pdf
    • https://bisowepot.weebly.com/uploads/1/3/4/5/134598436/tafuv.pdf
    • https://cdn.sqhk.co/soxobiwefili/5iaibhh/galaxy_watch_active_3_vs_active_2.pdf
    • https://cdn.sqhk.co/vefusujix/ijgigwt/colors_that_go_well_together_painting.pdf
    • https://gedozunirep.weebly.com/uploads/1/3/1/0/131070722/kevibixanege.pdf
    • https://cdn.sqhk.co/nepajenine/erjqiaP/77918340934.pdf
    • https://rizomoxus.weebly.com/uploads/1/3/4/5/134589692/773547.pdf
    • https://cdn.sqhk.co/buzaxelubot/7XgiydU/checkers_2_for_4.pdf
    • https://cdn.sqhk.co/lebapivi/hiibha9/sales_support_asset_management_salary.pdf
    • https://wuwotozon.weebly.com/uploads/1/3/4/3/134315251/4f2de559ad.pdf
    • https://vopusufibos.weebly.com/uploads/1/3/4/7/134731751/2057420.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/fa5e9b54-be7d-45b1-be32-04ab2463aa87/a_history_of_indian_philosophy_volume_5_by_surendranath_dasgupta.pdf
    • http://tufitokinetesez.rf.gd/teachers_day_short_speech_in_english.pdf
    • http://lozufoxozaniso.rf.gd/32211392724.pdf
    • http://mapelapelebiben.rf.gd/configuracion_de_telefono_ip_grandstream_gxp1405.pdf
    • https://uploads.strikinglycdn.com/files/03c4b792-6028-4a60-a543-722c30619b7c/how_to_repair_keurig_k10.pdf
    • http://sogisujomixugo.epizy.com/8607338471.pdf
    • http://gedonisezif.epizy.com/saxupufuvesejak.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_off0000e535.bin
bdfcec63077db4db6d904474099427ca22bfe607139a6fadc92d625214887225		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE535 5176 bytes
font_01_sfnt_off0000f6e0.bin
fba65e14c3c7301393ba2c2bca91b0c23649843bed95f7d4a356f0acac4d71f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E0 10908 bytes
font_02_sfnt_off00011c14.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C14 4324 bytes

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