Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0a3ae375a044a15…

MALICIOUS

PDF

80.7 KB Created: 2021-04-02 02:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dec6a74ea00d9bed604c85fc8e0be5b8 SHA-1: 75543038126a4335988aa4dc08eb4cbebdce45cc SHA-256: b0a3ae375a044a1533948f50ae4bd745a651ba77b1776fe1c651216ec969b30e
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. An external URI, https://nipisod.ru/strik?utm_term=how+high+were+the+walls+of+babylon, was found embedded within the document, suggesting a phishing or malware distribution attempt. The presence of wkhtmltopdf in the metadata and the nature of the embedded URL point towards a potential phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • 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://nipisod.ru/strik?utm_term=how+high+were+the+walls+of+babylon
    • http://hushseo.online/focusrite_scarlett_6i6_driver_macig0st.pdf
    • http://vizazovabula.mywebcommunity.org/48561786395.pdf
    • http://dwatches.site/xamujaselitisen5.pdf
    • http://rusherx.studio/694068186916kopy.pdf
    • http://pubggaming.online/creative_presentation_format_ideasnqs10.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/25330286-9b3f-436c-9f49-9d0db29e7197/frigidaire_70_pint_dehumidifier_with_pump.pdf
    • https://uploads.strikinglycdn.com/files/4ed3e5b8-04a9-4426-a2dd-ffaee6ab84ab/trouble_obsessionnel_compulsif_dfinition_larousse.pdf
    • https://s3.amazonaws.com/bufexa/ditudegilepolojuzeb.pdf
    • https://uploads.strikinglycdn.com/files/37530762-a44a-4bef-89f3-96179c983ac2/36430754549.pdf
    • https://uploads.strikinglycdn.com/files/3d628578-6dc1-4ceb-b9b9-5259231e54a8/26128085213.pdf
    • https://s3.amazonaws.com/mexavofezoxi/unit_10_lawmaking_process_answers.pdf
    • https://uploads.strikinglycdn.com/files/dbf506fa-333e-42b1-a761-d8a38639ff69/goditexabowotoseve.pdf
    • https://s3.amazonaws.com/dazemi/47454348226.pdf
    • https://s3.amazonaws.com/buganabowumujef/53404185804.pdf
    • https://uploads.strikinglycdn.com/files/620358dc-f733-41a4-b355-d032d60533a4/lakshmi_ashtottara_lyrics_in_hindi.pdf
    • http://noroved.myartsonline.com/addition_and_subtraction_decimals_worksheets.pdf
    • http://tuxodubikanirod.atwebpages.com/pawibalegamidomekunuj.pdf
    • https://uploads.strikinglycdn.com/files/f962e96b-3290-4139-bf7b-59bd5f21102e/wolf_oven_not_lighting.pdf
    • https://uploads.strikinglycdn.com/files/5db13fa1-b842-48e0-9c53-b19eb9059d61/instalacin_de_gas_natural_en_viviendas.pdf
    • https://uploads.strikinglycdn.com/files/9746a7db-029f-4ee2-949a-b3dfdce333d9/54701570789.pdf
    • https://uploads.strikinglycdn.com/files/afcb6449-1fdc-42f6-9a82-4687e0d40635/61165409453.pdf
    • https://s3.amazonaws.com/wazorixekunafob/daxojarawolup.pdf
    • https://uploads.strikinglycdn.com/files/82d71dc1-970a-45fc-9abd-47f2f2d666a0/sukasitidigiwasetopo.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fed1.bin
b3a6b7b8ee4603bbd618c248052c66fd898a4edb1225b196643145b34e0cd2ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFED1 5324 bytes
font_01_sfnt_off00011100.bin
ca5745314979e492c8a4cb178706dcb788a8007404900092f951f0958bf47ea9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11100 10956 bytes

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