Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcd84bc02962423d…

MALICIOUS

PDF

77.8 KB Created: 2021-03-19 01:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09c0bc4cc1d39ffe22d8094d03719d4b SHA-1: 17cc1ba8d956f33e11ed9b5dc69d6077b98d378e SHA-256: dcd84bc02962423ddd29677899aa9463c0183a079bb70a7f5e2d02bd0c1cb36b
96 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. It contains an embedded URL pointing to a suspicious domain, which is likely intended to lead the user to a phishing or malware distribution site. The document body appears to be malformed or obfuscated, but the presence of the external URI heuristic and the malicious verdict strongly indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/123?utm_term=polyethylene+foam+sheets+melbourne
    • https://static.s123-cdn-static.com/uploads/4367297/normal_60031124aef07.pdf
    • https://static.s123-cdn-static.com/uploads/4381976/normal_5ffbdd9493321.pdf
    • https://cdn-cms.f-static.net/uploads/4408321/normal_60130a12632c6.pdf
    • https://cdn-cms.f-static.net/uploads/4459177/normal_60157f0cd0b78.pdf
    • https://cdn.sqhk.co/duwenaxiseve/AjedJie/97284483370.pdf
    • https://cdn.sqhk.co/xakelafu/jhChfgy/skyscraper_demi_lovato_karaoke.pdf
    • https://static.s123-cdn-static.com/uploads/4446045/normal_5fc96cf2aa2e7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vinejivunitego/binotube.pdf
    • https://uploads.strikinglycdn.com/files/29751f74-af32-43a9-98b7-3510d6d478dd/sistema_endocrino_enfermedades.pdf
    • https://a9b7993f-6967-48c1-a2c3-d5bc86fe985f.filesusr.com/ugd/ea2be3_e751efcffd7749b1977808f52130435a.pdf?index=true
    • https://s3.amazonaws.com/mukutud/how_much_does_starbucks_pay_minors.pdf
    • https://uploads.strikinglycdn.com/files/b5aff421-eb24-4af5-8852-034932def6e8/ejercicios_gramatica_ingles_bachillerato_resueltos.pdf
    • https://s3.amazonaws.com/supefujoxopubu/photoshop_cs6_tutorials_free_download.pdf
    • https://s3.amazonaws.com/jolozidabi/test_de_inteligencias_multiples_para_nios_imprimir.pdf
    • https://uploads.strikinglycdn.com/files/bcda5e06-a722-4b1c-9c1d-1f321cb3166a/xuwoduvemixigarelelejofol.pdf
    • https://s3.amazonaws.com/xamibudasagas/biceps_tendon_tear_exercises.pdf
    • https://99f4a897-b223-4833-863a-50ad465ba5d5.filesusr.com/ugd/8e2371_ad75dfb296404ca2aaaf8383bfce4876.pdf?index=true
    • https://f18b8dc1-3ce9-44bd-8712-01435d039869.filesusr.com/ugd/b97cba_1815d08876314150977fe33802be51fb.pdf?index=true
    • https://s3.amazonaws.com/kotenu/redaserukarazajesebodosut.pdf
    • https://s3.amazonaws.com/natewared/ramegezuwawaguj.pdf
    • https://uploads.strikinglycdn.com/files/1b8ded8c-9b01-49f1-95a4-b3432e7365ad/craftsman_mini_tiller_will_not_start.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_off0000f30e.bin
d41d72293afaa9269e9097ba6bdac6edbd667fcab4e8a705a1ece79294d54df5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 5248 bytes
font_01_sfnt_off000104c6.bin
e5a49032d04c28d15f676f81ed9a9588829e50e7933df80b04fab8321294c033		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104C6 10900 bytes

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