Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd94416cf860945…

MALICIOUS

PDF

76.4 KB Created: 2021-03-18 05:54:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9874c7e94c828a1b1d11032477162cb4 SHA-1: a8d1a8900a478b44eeb66684bffba62d6e6849a7 SHA-256: 4dd94416cf8609455d8dbf26799890d3ccf83ef98febd435c9b34553fefe5491
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF sample exhibits characteristics of a malicious document, including a high ML classifier score and ClamAV detection as a phishing trojan. It functions as a link farm, hosting numerous external URLs, likely to manipulate search engine results or distribute malware. The presence of a 'download' button lure further supports a malicious intent to trick users into downloading harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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 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.
  • 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.
  • 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://leonvi.ru/123?utm_term=counter+strike+1.+8++game PDF link annotation
    • http://policyhelpcenter.com/pre_calculus_grade_11_teachers_guidekl90r.pdfIn PDF document text
    • https://pixadodo.weebly.com/uploads/1/3/2/7/132740612/gebuxew.pdfIn PDF document text
    • http://bloodcraft.online/transport_coordinator_job_interview_questions_and_answersc58fk.pdfIn PDF document text
    • http://salon-fresh1.ru/listening_answers_of_cycling_holiday_in_austria4la28.pdfIn PDF document text
    • https://dibekojiworibo.weebly.com/uploads/1/3/1/6/131637919/e8d1c78d85d.pdfIn PDF document text
    • https://welirupew.weebly.com/uploads/1/3/4/6/134662060/1276401.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/2357104.pdfIn PDF document text
    • https://meluwirukumipi.weebly.com/uploads/1/3/1/4/131483006/ruligaxulilojusowa.pdfIn PDF document text
    • http://chambrehq.xyz/diccionario_bblico_holman_gratisn7fc1.pdfIn PDF document text
    • https://vafiradas.weebly.com/uploads/1/3/3/9/133988778/wubazo.pdfIn PDF document text
    • https://winiwezunubesu.weebly.com/uploads/1/3/1/3/131379740/181885.pdfIn PDF document text
    • https://xerotopofuwega.weebly.com/uploads/1/3/1/4/131406930/3234115.pdfIn PDF document text
    • https://bibatajikoxego.weebly.com/uploads/1/3/5/3/135315017/6739816.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kojoduperoko.epizy.com/new_testament_bible_study_lessons.pdfIn PDF document text
    • http://wajabopekat.epizy.com/pikanalagobegazurodusude.pdfIn PDF document text
    • http://wipapirub.epizy.com/zabiteleduvetufulololevaf.pdfIn PDF document text
    • http://wobagelamabix.rf.gd/black_and_decker_coffee_maker_manual_auto_clean.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_off0000eea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 5220 bytes
SHA-256: fd1e9adf1038638082ed145db0c77c0bfd9f5d4cbf4fa9154488ef374111408b
font_01_sfnt_off0001005a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005A 10732 bytes
SHA-256: 0f9cb08d399d5fd2294407634820c0c40b38099447fe81acb80dbf673f8fbc22

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