Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6bb7676d322a10…

MALICIOUS

PDF

80.0 KB Created: 2021-03-11 00:15:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c958480b075f0f3fa52bef4abdf08ef7 SHA-1: beefb7174c82ca677c04d84e76cc05c81859f8d6 SHA-256: df6bb7676d322a1081b240b0677135a40af36962227fea5331b3997eada20438
226 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm designed to redirect users to potentially malicious websites, as indicated by the numerous external URIs and the 'PDF_SEO_LINK_FARM' heuristic. The presence of a password-protected archive lure suggests an attempt to bypass security scanning by encrypting a secondary payload. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/strik?utm_term=dewalt+pressure+washer+surface+cleaner+lowes PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450732/normal_5fed81cd634d5.pdfIn PDF document text
    • https://wipolupenigikof.weebly.com/uploads/1/3/2/7/132712614/vategofidib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477630/normal_6012a709b3eae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494648/normal_5fd6c39192c2a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389568/normal_5fd19f9e3aad3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408001/normal_603cfdf114bcb.pdfIn PDF document text
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/8974208.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373997/normal_5fdbe3470628a.pdfIn PDF document text
    • https://riledamulobav.weebly.com/uploads/1/3/0/9/130969772/vewuk.pdfIn PDF document text
    • https://wopokajam.weebly.com/uploads/1/3/0/8/130874492/7657424.pdfIn PDF document text
    • https://busonuvawariba.weebly.com/uploads/1/3/4/3/134355681/7297503.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/21cd0a22-586e-497b-84a0-9a59ac1ef40d/create_dynamic_json_string_c.pdfIn PDF document text
    • https://37523d11-79cf-4eb3-ada4-f05de57c71ee.filesusr.com/ugd/275374_7c579a9f7ae14812b21ecc8b43465021.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2637079c-fe35-4509-a0b0-833dbc7e0926/most_popular_spanish_words_in_english_speaking.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23df968d-fc0d-48d2-8f6c-c477dbbdf692/how_do_you_fix_a_grohe_faucet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40a3a37b-390e-4e2a-bce3-8575af539c81/amazon_echo_studio_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82e39155-bd86-42b9-b405-9d569834e08a/47725108296.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45c0a077-f52d-43a6-be22-04eb6fc48773/94376696300.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14235ca9-2009-4be2-bc0a-fb794a7d086e/how_to_say_your_ugly_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a47a9746-e8bf-4885-82bc-274f38ab6e47/fsx_skidrow_rar_password.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89014719-16a7-4e2f-b780-07f0e5a230ac/rudimedumowasoxaliwekep.pdfIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_9c786850e87e458cb4a8158a778f010c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/578ad7c9-9100-4b44-a159-5769c1184bf2/number_the_stars_chapter_6_questions_and_answers.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_off0000fc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC87 5192 bytes
SHA-256: 5cf1e4fa450b8a787ab6b4313dd4700cd0da44fd332a528f3a4177894e57550a
font_01_sfnt_off00010e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E47 10548 bytes
SHA-256: 4426f434db746b05ddf45e6580b154b659b9d16bc3eaf7ecad072776d20f0435