Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0ea4458d48e5f8f…

MALICIOUS

PDF

76.9 KB Created: 2021-04-25 16:54:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2babcb052121d975f57bd75f0d3833c SHA-1: 183f7c503a97a0c5fd12045f96d4c839646d83dc SHA-256: d0ea4458d48e5f8f98c1383e42776143231ee168175696982bfff8af88c372f0
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It contains a large number of external links, suggesting a link farm or redirection mechanism to malicious sites. The document body, though partially corrupted, contains a query about child support cases, likely a lure to encourage users to click the embedded links. No scripts were extracted, but the PDF structure itself facilitates the malicious linking.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://resalured.ru/strik?utm_term=can+you+look+up+child+support+cases
    • http://kebuwakuje.medianewsonline.com/ttd_telugu_calendar_2020_download.pdf
    • http://vakiduweg.mygamesonline.org/badizorimawufemuworije.pdf
    • http://sibatike.getenjoyment.net/61731126174.pdf
    • https://cdn.sqhk.co/lutaxudepoje/nhhaIgh/medbridge_education_reviews.pdf
    • https://cdn.sqhk.co/tebefaravuz/hZhfoh7/nadupetukufebotokuzu.pdf
    • https://cdn.sqhk.co/wuvupalib/vicljj7/gebazixagubuwuw.pdf
    • https://naruvoraxosu.weebly.com/uploads/1/3/0/8/130873998/e141e5e.pdf
    • https://wekigenajelu.weebly.com/uploads/1/3/3/9/133999196/2444607.pdf
    • http://damewonuseba.sportsontheweb.net/can_t_hurt_me_david_goggins.pdf
    • https://cdn.sqhk.co/lomasamube/jfjbhav/panic_button_app_uk.pdf
    • https://cdn.sqhk.co/mixaluwekitu/gchihf9/directv_now_sunday_ticket_eligibility.pdf
    • http://wasegulom.mygamesonline.org/train_time_table_book.pdf
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/077f7c0fac66b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://jomopizemiz.onlinewebshop.net/bookkeeping_job_interview_questions_and_answers.pdf
    • https://8860adff-7f0b-4cf3-a358-cdd560dff136.filesusr.com/ugd/625844_2157a0f6486b4269b7d4ae582b429614.pdf?index=true
    • http://penanaras.myartsonline.com/weneforibosuguvuma.pdf
    • https://d7b50aa0-fea3-4edc-ba9e-4ed0094b0c60.filesusr.com/ugd/7f614e_f1fa98aaae9d461fae9b12083b8ff5ce.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0eb.bin
bb68db33646904faa3d9c87f2e1411128a2503d06fe16c37c8a390491e940cb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EB 5232 bytes
font_01_sfnt_off0000f2b5.bin
ee2bfbb2a510b5ac7d934be75768f558e4efcbbb3ef2a86d7ff941489e66be74		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B5 10924 bytes
font_02_sfnt_off0001181c.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1181C 4324 bytes

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