Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de143323e8a2340…

MALICIOUS

PDF

83.1 KB Created: 2021-03-26 03:49:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3918b78cd6d1d2f242dac5b09f9d2d3d SHA-1: 545893f828fda2539531066be9e46829b006c39e SHA-256: 5de143323e8a23404b503a1d3d1c949734960b94e09f048c49d95e537d71ed41
104 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains text related to a constellation app search, suggesting a phishing or social engineering lure. The presence of an external URI pointing to 'kuzutuzo.ru' further supports the malicious nature, likely serving as a download or redirection point for a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=what+is+the+best+free+constellation+app+for+iphone
    • http://taforojujutusig.mygamesonline.org/reliance_606_water_heater_element_part_number.pdf
    • http://tobufupevujuma.mygamesonline.org/safufevuriv.pdf
    • http://saniwofixapu.mygamesonline.org/avivamento_do_pais_de_gales.pdf
    • http://zibodotuf.mygamesonline.org/jajeregubotutus.pdf
    • http://kolekewoni.mywebcommunity.org/maru_bessie_head_download.pdf
    • http://rerixen.scienceontheweb.net/schenley_park_pavilion_rental.pdf
    • http://tifusavegapawuf.mygamesonline.org/how_to_find_out_what_transmission_i_have_by_vin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://dudibagigop.rf.gd/ankylosing_spondylitis_guidelines_2020.pdf
    • https://s3.amazonaws.com/zonebon/disgaea_1_switch_guide.pdf
    • http://xemubekimivimed.epizy.com/cydia_app_admin.pdf
    • https://4cf6c2b4-cd84-4b73-83b1-bf7f441162b2.filesusr.com/ugd/e50c99_46fbaea1151f4fe78e0d9af31d603552.pdf?index=true
    • http://tubulufegufixo.rf.gd/xupovid.pdf
    • http://lurarapekakaka.atwebpages.com/63919496405.pdf
    • https://s3.amazonaws.com/muwomapotumugi/dusaluduwugabozeno.pdf
    • https://uploads.strikinglycdn.com/files/d998481d-f23f-467f-8aa8-3ef4791e2593/line_6_bass_floor_pod_review.pdf
    • https://uploads.strikinglycdn.com/files/f8d8f8e3-b08f-43b2-a0d4-eb3d2f42af3c/30327526178.pdf
    • https://uploads.strikinglycdn.com/files/14011233-adb3-45a7-a9eb-1644b5a297c3/zukom.pdf
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_edfed43a005449c0b43f5c316dcee563.pdf?index=true
    • https://s3.amazonaws.com/ragejufa/47130916671.pdf
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_bce9b8c56942417c993b873444f87c19.pdf?index=true
    • http://zujozidokoj.rf.gd/71051117390.pdf
    • http://mumufikoxid.epizy.com/chief_architect_premier_x10_crack.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_off0000f850.bin
65c23f54bf493345a995504f1637aed89a921a221a8252ee9325b312e2bdcd56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF850 5044 bytes
font_01_sfnt_off00010967.bin
393319a49e594cc6dbc6a531a5df72414d857799bfe15a3b2441a7f46460716f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10967 11404 bytes
font_02_sfnt_off00012eda.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDA 4324 bytes

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