Malicious PDF — malware analysis report

Static analysis result for SHA-256 504e43c541345fb0…

MALICIOUS

PDF

103.9 KB Created: 2021-02-26 11:23:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d32bfd31961b83b475c6637eea7342d9 SHA-1: e9550b157acf74c4c2c9bb0d64ee56dd7f895d7c SHA-256: 504e43c541345fb0fc6910149ce9e5eaf2f835b28512866302b9d26fdeac422f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • 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://jottigo.ru/strik?utm_term=36-48+months+developmental+milestones PDF link annotation
    • https://warexuzema.weebly.com/uploads/1/3/4/6/134601764/wekon-magoku-xowuvipasep.pdfIn PDF document text
    • https://towipikegogu.weebly.com/uploads/1/3/4/6/134690187/c146e28fee478c.pdfIn PDF document text
    • http://tur8osale.site/install_adobe_reader_ubuntu_command_lineobz3d.pdfIn PDF document text
    • http://hairsprof.ru/gestion_de_la_calidad_total_cuatrecasas4j3e9.pdfIn PDF document text
    • https://sezebotari.weebly.com/uploads/1/3/1/6/131636698/3305491.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/excelsior_definition_greek.pdfIn PDF document text
    • https://cdn.sqhk.co/vefemenivu/egdihgd/truck_simulator_offroad_4_mod_apk_download.pdfIn PDF document text
    • http://kungfumalibu.com/iceberg_slim_books_in_order54yt4.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/jumpsuits_and_rompers_plus_size.pdfIn PDF document text
    • https://zeteleginogegop.weebly.com/uploads/1/3/4/5/134526156/pijunukozil.pdfIn PDF document text
    • https://jepejopik.weebly.com/uploads/1/3/4/6/134610321/gepuwa_novopak_sekin_wipada.pdfIn PDF document text
    • https://furimubabo.weebly.com/uploads/1/3/1/8/131856330/soxideramino.pdfIn PDF document text
    • https://munulokepopat.weebly.com/uploads/1/3/5/2/135297381/bolubugima.pdfIn PDF document text
    • http://repaircreditscore.info/dell_xps_13_9360_hackintosh_guide5voon.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00015bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BB2 5700 bytes
SHA-256: 440a7a7cebee6c4cd19d2a0ac73752f0bd7fbd70be5fece5337ba6e934bf2428
font_01_sfnt_off00016f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F00 10300 bytes
SHA-256: 3120f9b3be360c0a4ba8e0d7441bc0b750ace0e3643488248e37f39ad1e16919

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