Malicious PDF — malware analysis report

Static analysis result for SHA-256 c554cdfefcb5fb87…

MALICIOUS

PDF

75.0 KB Created: 2021-03-18 20:01:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 700d078d15a18a2562a936cab1c42799 SHA-1: f8475e1a0575cc5505c630ff6dcc1ba706e5cf60 SHA-256: c554cdfefcb5fb87664f78c1b40e74423d90259ac8683e566d4b81be4bb6e0c9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URIs, including one pointing to 'soxebez.ru', suggests the document is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that this PDF is part of a scheme to host many links on disposable domains, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://soxebez.ru/123?utm_term=video+wallpaper++hd0 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376404/normal_601000f9b3670.pdfIn PDF document text
    • http://monubagujizud.mywebcommunity.org/medical_fitness_certificate_for_college_admission_2020.pdfIn PDF document text
    • http://venira.su/dell_optiplex_390_lan_drivers_download_for_windows_7f8fxt.pdfIn PDF document text
    • http://lixebafevoku.mypressonline.com/52442501944.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383579/normal_6025e6314bc70.pdfIn PDF document text
    • http://damita.fun/nagokanepods38k2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413473/normal_5ff1faaaac03d.pdfIn PDF document text
    • https://cdn.sqhk.co/vamosopon/gg4Ugdv/99883284470.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369509/normal_604cb2c947d78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462350/normal_604aed94d3f9f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459636/normal_5fe50dc06dc2c.pdfIn PDF document text
    • http://mosquito.codes/93177604344hpd3l.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413004/normal_5fc9797184911.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450439/normal_5fe50c74a2e45.pdfIn PDF document text
    • http://bestrongbyg.com/24666445461bh3d6.pdfIn PDF document text
    • http://alcozerox.com/8883866725sombu.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/rS9jihi/78162939147.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://piwakitidi.onlinewebshop.net/corsair_commander_pro_management_control_board__software.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b4707d4-2f00-4db5-bd15-f7de8d627f59/examples_of_air_borne_diseases_in_plants.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f5e2a5c-2305-4873-96ea-af566c33d604/six_of_crows_netflix_cast_nina.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC8 5068 bytes
SHA-256: 1f25452916f3b55e7c99d19c515616b35914a3880a5852fd708de49d1302eadb
font_01_sfnt_off0000ee10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE10 20808 bytes
SHA-256: 827387c2ea54ddc000f5aa70a27a6299ced6f4ec67ffa87ab8f107913c232b88

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