Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c3e5aaddbe5908a…

MALICIOUS

PDF

79.5 KB Created: 2021-03-25 00:59:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 0bf5771744df6ba2a13d6c5d99ce334c SHA-1: a6889151b302fb0dfa74d7a2f438a3a9c2007cc6 SHA-256: 1c3e5aaddbe5908aecedda66137257e229b289e0972589310c02857ec7289b51
126 Risk Score

Malware Insights

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

The PDF contains numerous external URIs, many pointing to disposable hosting, indicating a link farm designed to distribute malware or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://ponafet.ru/strik?utm_term=what+living+things+need+worksheet PDF link annotation
    • http://mapitunokon.22web.org/52812892825.pdfIn PDF document text
    • http://punavuvipufov.sportsontheweb.net/common_core_standards_california_ela_7th_grade.pdfIn PDF document text
    • https://xizogezoki.weebly.com/uploads/1/3/4/7/134717510/4e151f2e.pdfIn PDF document text
    • https://nawobelif.weebly.com/uploads/1/3/5/3/135307193/jebixuninef-bafiriwujam-busarinizigur-mazaretepamaro.pdfIn PDF document text
    • http://gasolotiravizid.sportsontheweb.net/iso_9001_quality_management_system_logo.pdfIn PDF document text
    • https://tezadogiva.weebly.com/uploads/1/3/4/5/134522012/0d805b7e329f5f.pdfIn PDF document text
    • https://faturigazed.weebly.com/uploads/1/3/4/8/134859690/kidiw.pdfIn PDF document text
    • http://piwofoterif.sportsontheweb.net/tikegezevepu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pupagerirawax.myartsonline.com/nezobepibegurab.pdfIn PDF document text
    • http://kuzoxutinilidog.rf.gd/developmental_psychology_early_adulthood.pdfIn PDF document text
    • http://bizedesaxifu.onlinewebshop.net/cs_lewis_the_four_loves_download.pdfIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/wurufisesozez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e5b6f73-6742-4748-bee7-1e399ff13131/metodologia_dela_investigacion_hernandez_fernandez_baptista.pdfIn PDF document text
    • https://s3.amazonaws.com/kitakilesa/17815314172.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/kavugofawejo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40cb13ca-7bac-4fef-857f-aef0aa0f881d/the_adventures_of_huckleberry_finn_chapter_19_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/71214f00-6339-4a79-9c02-bf41de243f17/wumulosunovopotilurowoxif.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBA 5104 bytes
SHA-256: cf217e50a631056fd0bc28374445739d8ebb5ae1a65badd163f6fd28a6b3c1e5
font_01_sfnt_off0000fe24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE24 10736 bytes
SHA-256: d507b6ae68939cbb4db48ebdd6d0c50bb0c872932fe9ccc2543dabefa230ea05
font_02_sfnt_off000122ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AB 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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